| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 26. J O'Keefe vs D Byrne |
| 0-1 | 30 | 1957 | 58th US Open | A04 Reti Opening |
| 27. O Popovych vs J O'Keefe |
| 1-0 | 21 | 1957 | 58th US Open | B67 Sicilian, Richter-Rauzer Attack, 7...a6 Defense, 8...Bd7 |
| 28. J O'Keefe vs C Henin |
| 0-1 | 24 | 1957 | 58th US Open | A13 English |
| 29. H Fajans vs J O'Keefe |
| 1-0 | 30 | 1957 | 58th US Open | E70 King's Indian |
| 30. J O'Keefe vs A J Smith |
 | 0-1 | 26 | 1957 | 58th US Open | E38 Nimzo-Indian, Classical, 4...c5 |
| 31. Algirdas Nasvytis vs J O'Keefe |
| 1-0 | 41 | 1957 | 58th US Open | B72 Sicilian, Dragon |
| 32. J O'Keefe vs D Byrne |
| ½-½ | 36 | 1958 | 59th US Open | D58 Queen's Gambit Declined, Tartakower (Makagonov-Bondarevsky) Syst |
| 33. J O'Keefe vs P Morrell |
| 1-0 | 31 | 1958 | 59th US Open | C29 Vienna Gambit |
| 34. J F Shaw vs J O'Keefe |
| 1-0 | 27 | 1958 | 59th US Open | E80 King's Indian, Samisch Variation |
| 35. G Madlener vs J O'Keefe |
| 1-0 | 25 | 1958 | 59th US Open | A16 English |
| 36. H Herbst vs J O'Keefe |
| ½-½ | 26 | 1959 | 60th US Open | B25 Sicilian, Closed |
| 37. J O'Keefe vs G Ramirez |
| 0-1 | 25 | 1959 | 60th US Open | E70 King's Indian |
| 38. J O'Keefe vs E McCormick |
| 0-1 | 34 | 1959 | 60th US Open | A22 English |
| 39. J O'Keefe vs E Jimenez Zerquera |
| ½-½ | 29 | 1959 | 60th US Open | E60 King's Indian Defense |
| 40. R Kause vs J O'Keefe |
| ½-½ | 32 | 1959 | 60th US Open | B68 Sicilian, Richter-Rauzer Attack, 7...a6 Defense, 9...Be7 |
| 41. J O'Keefe vs E Marchand |
| ½-½ | 36 | 1959 | 60th US Open | D30 Queen's Gambit Declined |
| 42. J O'Keefe vs Bisguier |
| 0-1 | 36 | 1960 | 61st US Open | C27 Vienna Game |
| 43. H Ohman vs J O'Keefe |
| ½-½ | 31 | 1960 | 61st US Open | A02 Bird's Opening |
| 44. J O'Keefe vs G Hartleb |
| 1-0 | 18 | 1960 | 61st US Open | A22 English |
| 45. J O'Keefe vs R Kause |
| 1-0 | 35 | 1960 | 61st US Open | E70 King's Indian |
| 46. J O'Keefe vs J Sherwin |
| 0-1 | 27 | 1960 | 61st US Open | E70 King's Indian |
| 47. J F Donovan vs J O'Keefe |
| 1-0 | 44 | 1960 | 61st US Open | D93 Grunfeld, with Bf4 & e3 |
| 48. Kathryn Slater vs J O'Keefe |
| ½-½ | 41 | 1962 | 63rd US Open | A48 King's Indian |
| 49. J O'Keefe vs J Orenstein |
| 1-0 | 27 | 1962 | 63rd US Open | A17 English |
| 50. Bisguier vs J O'Keefe |
| ½-½ | 35 | 1962 | 63rd US Open | B32 Sicilian |
Kibitzing
