| 1972 · 1972 24 Hours of Le Mans | DNF | 57 (reserve) | GTS 5.0 | North American Racing Team | Masten GregoryMasten Gregory Luigi Chinetti Jr | Ferrari 365 GTB/4 | Ferrari 4.4L V12 | 226 | Wikipedia contributors · CC BY-SA 4.0 |
| 1971 · 1971 24 Hours of Le Mans | DNF | 14 | S 5.0 | North American Racing Team | Masten Gregory · George EatonMasten Gregory George Eaton | Ferrari 512 S Spyder | Ferrari 5.0L V12 | 7 | Wikipedia contributors · CC BY-SA 4.0 |
| 1971 · Austrian 1000 Kilometres, Zeltweg | did_not_start | 23 | S5.0 | Herbert Müller | Heinrich Wiesendanger · Masten Gregory | Ferrari 512S | — | | WSPR historical record |
| 1971 · 24 h Daytona Beach | retired | 20 | S | Young American Racing Team | Masten Gregory · Gregg Young · DNS - John Cannon | Ferrari 512M | — | 16 | WSPR historical record |
| 1971 · Sebring 12 Hours | 51 | 20 | S | Young American Racing Team | Masten Gregory · Gregg Young | Ferrari 512M | — | 29 | WSPR historical record |
| 1970 · 1970 24 Hours of Le Mans | DNF | 37 | P 3.0 | Autodelta SpA | Toine Hezemans · Masten GregoryToine Hezemans Masten Gregory | Alfa Romeo T33/3 | Alfa Romeo 3.0L V8 | 5 | Wikipedia contributors · CC BY-SA 4.0 |
| 1970 · Ausrian 1000 Kilometres, Zeltweg | disqualified | 2 | P3.0 | Autodelta SpA | Toine Hezemans · Masten Gregory | Alfa Romeo T33/3-71 | — | | WSPR historical record |
| 1970 · Sebring 12 Hours | 3 | 33 | 2. P3.0 | Autodelta SpA | Toine Hezemans · Masten Gregory | Alfa Romeo T33/3 | — | 247 | WSPR historical record |
| 1970 · 1000 km Monza | 18 | 39 | P3.0 | Autodelta SpA | Masten Gregory · Toine Hezemans | Alfa Romeo T33/3 | — | 131 | WSPR historical record |
| 1970 · Targa Florio | retired | 14 | P3.0 | Autodelta SpA | Toine Hezemans · Masten Gregory | Alfa Romeo T33/3 | — | 5 | WSPR historical record |
| 1970 · Targa Florio | source_section_running_in_practice | 6T | P3.0 | Autodelta SpA | Masten Gregory | Alfa Romeo T33/3 | — | | WSPR historical record |
| 1970 · 1000 km Nürburgring | entry_only | 7 | P3.0 | Autodelta SpA | Masten Gregory · Toine Hezemans | Alfa Romeo T33/3 | — | | WSPR historical record |
| 1969 · 1969 24 Hours of Le Mans | DNF | 2 | S 5.0 | Scuderia Filipinetti | Joakim 'Jo' Bonnier · Masten GregoryJoakim 'Jo' Bonnier Masten Gregory | Lola T70 Mk.IIIB | Chevrolet 5.0L V8 | 196 | Wikipedia contributors · CC BY-SA 4.0 |
| 1969 · 24 h Daytona | 15 | 61 | 2. S2.0 | Sportscars Unlimited of Swi | Masten Gregory · Richard Broström | Porsche 910 | — | 544 | WSPR historical record |
| 1969 · Austrian GP, 1000 km Zeltweg | 4 | 11 | 1. P3.0 | Sport Cars Brostrom | Masten Gregory · Richard Broström | Porsche 908/02 | — | 168 | WSPR historical record |
| 1969 · Brands Hatch, BOAC 500 miles | entry_only | 23 | | Sportscar Switzerland | Richard Broström · Masten Gregory | Porsche 910 | — | | WSPR historical record |
| 1969 · 1000 km Monza | did_not_start | 43 | S2.0 | Sportscars Unlimited | Richard Broström · Masten Gregory | Porsche 910 | — | | WSPR historical record |
| 1969 · ADAC 1000 kilometres Nürburgring | retired | 78 | S2.0 | Sportscars Unlimited | Masten Gregory · Richard Broström | Porsche 910 | — | 15 | WSPR historical record |
| 1969 · Watkins Glen 6 Hours, 22nd Annual Sports Car Weekend at Watkins Glen | entry_only | 3 | P3.0 | Sports Cars of Switzerland | Masten Gregory · Richard Broström | Porsche 908 Spyder | — | | WSPR historical record |
| 1968 · 1968 24 Hours of Le Mans | DNF | 14 | S 5.0 | North American Racing Team | Masten GregoryMasten Gregory Charlie Kolb | Ferrari 250LM | Ferrari 3.3L V12 | 209 | Wikipedia contributors · CC BY-SA 4.0 |
| 1968 · 24 h Daytona | retired | 81 | S | North American Racing Team | David Piper · Masten Gregory | Ferrari 250LM | — | 101 | WSPR historical record |
| 1967 · 24 h Daytona | retired | 28 | P2.0 | North American Racing Team | Jo Schlesser · Masten Gregory · Peter Gregg | Ferrari Dino 206S | — | 338 | WSPR historical record |
| 1966 · 1966 24 Hours of Le Mans | DNF | 18 | P 5.0 | North American Racing Team | Masten Gregory · Bob BondurantMasten Gregory Bob Bondurant | Ferrari 365 P2 | Ferrari 4.4L V12 | 88 | Wikipedia contributors · CC BY-SA 4.0 |
| 1966 · 24 h Daytona | 17 | 92 | 2. S+3.0 | Essex Wire Corporation | Peter Revson · Masten Gregory · Ed Lowther | Ford GT40 | — | 531 | WSPR historical record |
| 1966 · 12 h Sebring | 53 | 20 | S5.0 | Essex Wire Corporation | Masten Gregory · Augie Pabst | Ford GT40 | — | 30 | WSPR historical record |
| 1966 · 1000 km Monza | 2 | 5 | 1. S+3.0 | Essex Wire Corporation | Masten Gregory · John Whitmore | Ford GT40 | — | 99 | WSPR historical record |
| 1965 · 1965 24 Hours of Le Mans | 1 | 21 | P 4.0 | North American Racing Team | Masten Gregory · Jochen RindtMasten Gregory Jochen Rindt | Ferrari 250 LM | Ferrari 3.3L V12 | 348 | Wikipedia contributors · CC BY-SA 4.0 |
| 1964 · 1964 24 Hours of Le Mans | DNF | 11 | P 5.0 | Ford Motor Company | Richie Ginther · Masten GregoryRichie Ginther Masten Gregory | Ford GT40 Mk.I | Ford 4.2L V8 | 63 | Wikipedia contributors · CC BY-SA 4.0 |
| 1964 · Grand Prix Reims 12 Hours | retired | 5 | P+3.0 | Ford Motor Co. | Richie Ginther · Masten Gregory | Ford GT40 | — | | WSPR historical record |
| 1964 · Targa Florio | retired | 148 | GT+3.0 | Shelby American Inc. | Masten Gregory · Innes Ireland | Shelby Cobra | — | 6 | WSPR historical record |
| 1963 · 1963 24 Hours of Le Mans | 6 | 26 | GT 3.0 | North American Racing Team | Masten Gregory · David PiperMasten Gregory David Piper | Ferrari 250 GTO /LMB | Ferrari 3.0L V12 | 312 | Wikipedia contributors · CC BY-SA 4.0 |
| 1962 · 1962 24 Hours of Le Mans | DNF | 20 | GT 3.0 | UDT Laystall Racing Team | Innes Ireland · Masten GregoryInnes Ireland Masten Gregory | Ferrari 250 GTO | Ferrari 3.0L V12 | 165 | Wikipedia contributors · CC BY-SA 4.0 |
| 1962 · VIII. Int. ADAC 1000 km Nürburgring | entry_only | 95 | S3.0 | UDT-Laystall | Innes Ireland · Masten Gregory | Ferrari | — | | WSPR historical record |
| 1962 · VIII. Int. ADAC 1000 km Nürburgring | entry_only | 125 | P4.0 | Scuderia Serenissima | Graham Hill · Masten Gregory | Maserati Tipo 151 | — | | WSPR historical record |
| 1962 · VIII. Int. ADAC 1000 km Nürburgring | 18 | 99 | 1. P3.0 | Camoradi USA | Lloyd Casner · Masten Gregory | Maserati CDM (Tipo 61) | — | 37 | WSPR historical record |
| 1961 · 1961 24 Hours of Le Mans | 5 | 33 | S 2.0 | Porsche KG | Masten GregoryMasten Gregory Bob Holbert | Porsche RS61 Spyder | Porsche 1967cc F4 | 309 | Wikipedia contributors · CC BY-SA 4.0 |
| 1961 · Sebring 12 Hours | 56 | 24 | S3.0 | Camoradi USA | Masten Gregory · Lloyd Casner · Stirling Moss · DNS - Skip Hudson · DNS - Graham Hill | Maserati Tipo 63 | — | | WSPR historical record |
| 1961 · 1000 km Nürburgring | 1 | 1 | 1. S3.0 | Camoradi USA | Masten Gregory · Lloyd Casner | Maserati Tipo 61 Birdc | — | 44 | WSPR historical record |
| 1960 · 1960 24 Hours of Le Mans | DNF | 24 | S3.0 | Camoradi USA | Masten Gregory · Chuck DaighMasten Gregory Chuck Daigh | Maserati Tipo 60/61 | Maserati 2.9L S4 | 82 | Wikipedia contributors · CC BY-SA 4.0 |
| 1960 · 1000 km Buenos Aires | retired | 20 | S3.0 | Camoradi International | Dan Gurney · Masten Gregory | Maserati Tipo 61 Birdc | — | 56 | WSPR historical record |
| 1960 · Sebring 12 Hours | 64 | 22 | S3.0 | Camoradi USA | Carroll Shelby · Masten Gregory | Maserati Tipo 61 Birdc | — | 3 | WSPR historical record |
| 1960 · 1000 km Nürburgring | 5 | 6 | 3. S3.0 | Camoradi USA | Masten Gregory · Gino Munaron · DNS - Umberto Maglioli | Maserati Tipo 61 Birdc | — | 43 | WSPR historical record |
| 1959 · 1959 24 Hours of Le Mans | DNF | 3 | S3.0 | Ecurie Ecosse | Innes Ireland · Masten GregoryInnes Ireland Masten Gregory | Jaguar D-type | Jaguar 3.0L S6 | 70 | Wikipedia contributors · CC BY-SA 4.0 |
| 1959 · 1000 km Nürburgring | retired | 7 | S3.0 | Ecurie Ecosse | Masten Gregory · Innes Ireland · DNS - John Lawrence | Lister Monza Jaguar | — | 5 | WSPR historical record |
| 1959 · XXIV. R.A.C. Tourist Trophy, Goodwood | retired | 6 | S3.0 | Ecurie Ecosse | Jim Clark · Masten Gregory | Tojeiro - Jaguar | — | | WSPR historical record |
| 1958 · 1958 24 Hours of Le Mans | DNF | 6 | S3.0 | Ecurie Ecosse | Jack Fairman · Masten GregoryJack Fairman Masten Gregory | Jaguar D-type | Jaguar 3.0L S6 | 7 | Wikipedia contributors · CC BY-SA 4.0 |
| 1958 · 1000 km Buenos Aires | retired | 32 | S2.0 | — | Jo Bonnier · Masten Gregory | Maserati 200SI | — | 47 | WSPR historical record |
| 1958 · Sebring 12 Hours | 57 | 9 | S3.0 | Ecurie Ecosse | Ron Flockhart · Masten Gregory | Jaguar D-type | — | 55 | WSPR historical record |
| 1958 · 1000 km Nürburgring | retired | 9 | S3.0 | Ecurie Ecosse | Masten Gregory · Ron Flockhart | Jaguar D-type | — | 29 | WSPR historical record |
| 1958 · 23rd R.A.C. Tourist Trophy, Goodwood | 5 | 4 | 4. S3.0 | Ecurie Ecosse | Masten Gregory · Innes Ireland | Jaguar D-type | — | 143 | WSPR historical record |
| 1958 · 23rd R.A.C. Tourist Trophy, Goodwood | entry_only | 4 | S3.0 | Ecurie Ecosse | Masten Gregory · Innes Ireland | Tojeiro - Jaguar | — | | WSPR historical record |
| 1957 · 1957 24 Hours of Le Mans | 6 | 4 | S5.0 | D. Hamilton (private entrant) | Duncan Hamilton · Masten GregoryDuncan Hamilton Masten Gregory | Jaguar D-type | Jaguar 3.8L S6 | 299 | Wikipedia contributors · CC BY-SA 4.0 |
| 1957 · Autodromo Costaneva Norte, Buenos Aires 1000 Kilometres | 1 | 10 | 1. S+3.0 | Scuderia Temple Buell | Masten Gregory · Eugenio Castellotti - DNP · Luigi Musso · DNS - Cesare Perdisa | Ferrari 290MM | — | 98 | WSPR historical record |
| 1957 · Sebring 12 Hours | 4 | 15 | 3. S5.0 | George Tilp | Masten Gregory · Lou Brero | Ferrari 290S | — | 193 | WSPR historical record |
| 1957 · Mille Miglia | entry_only | 454 | S2.0 | — | Temple Buell · Masten Gregory | Ferrari 500 TRC | — | | WSPR historical record |
| 1957 · Nürburgring 1000 Kilometres | 10 | 7T | 8. S+2.0 | Scuderia Temple Buell (Scud | Masten Gregory · Olinto Morolli · DNS - Olivier Gendebien · DNS - Wolfgang von Trips · DNS - Peter Collins · DNS - Mike Hawthorn · DNS - Maurice Trintignant | Ferrari 250 TR | — | 42 | WSPR historical record |
| 1957 · Swerige GP 6 Hours, Rabelöf, Kristianstad | retired | 6 | S+2.0 | Scuderia Ferrari | Masten Gregory · Wolfgang Seidel | Ferrari 250 TR58 | — | 30 | WSPR historical record |
| 1957 · Venezuelan Grand Prix, 1000 km Caracas | retired | 10 | S+2.0 | Scuderia Tremble Buell | Masten Gregory · Dale Duncan | Maserati 450S | — | 1 | WSPR historical record |
| 1956 · Sebring 12 Hours | 42 | 20 | S5.0 | George Tilp | Phil Hill · Masten Gregory | Ferrari 857S | — | 61 | WSPR historical record |
| 1955 · 1955 24 Hours of Le Mans | DNF | 14 | S 3.0 | "Mike Sparken" (private entrant) | "Mike Sparken" (Michel Pobejersky) · Masten Gregory"Mike Sparken" (Michel Pobejersky) Masten Gregory | Ferrari 750 Monza | Ferrari 3.0L S4 | 23 | Wikipedia contributors · CC BY-SA 4.0 |
| 1955 · Sebring 12 Hours | 43 | 50 | 7. S2.0 | Ecurie Yankee | Tony Palmer-Morewood · Gleb Derujinsky · Masten Gregory | Ferrari 500 Mondial | — | 124 | WSPR historical record |
| 1955 · Sebring 12 Hours | 76 | 27 | S3.0 | Ecurie Yankee | Bob Said · Masten Gregory | Ferrari 750 Monza | — | 3 | WSPR historical record |
| 1955 · Tourist Trophy, Dundrod | did_not_start | 6 | S3.0 | Scuderia Ferrari | Olivier Gendebien · Masten Gregory | Ferrari 750 Monza | — | | WSPR historical record |
| 1955 · Tourist Trophy, Dundrod | 9 | 28 | 1. S1.5 | Huschke von Hanstein | Carroll Shelby · Masten Gregory · DNS - Huschke von Hanstein | Porsche 550 Spyder | — | 75 | WSPR historical record |
| 1954 · Buenos Aires 1000 Kilometres | 14 | 18 | 5. S+3.0 | Masten Gregory | Masten Gregory · DNS - Dale Duncan | Jaguar C-type | — | 79 | WSPR historical record |
| 1954 · Tourist Trophy, Dundrod | 9 | 31 | 2. S2.0 | Bob Said | Bob Said · Masten Gregory | Ferrari 500 Mondial | — | 75 | WSPR historical record |
| 1953 · Sebring 12 Hours | 48 | 36 | S8.0 | Masten Gregory | Masten Gregory · Tom Newcomer | Allard J2X Chrysler | — | 16 | WSPR historical record |