| 31st U.S. Senior Open Championship - Round 4 Best Rounds of the Day | |
| Updated 4:17 p.m. PDT | |
| * = Denotes 10th Tee Start; (a) = Denotes Amateur | |
| Pos | Player | Ctry | Total | Hole | Today | 1 | 2 | 3 | 4 | Total |
| 3 | BROWNE, Olin | ![]() | -2 | F | -5 | 73 | 70 | 70 | 65 | 278 |
| 5 | WATSON, Tom | ![]() | +1 | F | -4 | 70 | 70 | 75 | 66 | 281 |
| 12 | FORSMAN, Dan | ![]() | +5 | F | -3 | 78 | 71 | 69 | 67 | 285 |
| 3 | COOK, John | ![]() | -2 | F | -3 | 71 | 68 | 72 | 67 | 278 |
| 1 | LANGER, Bernhard | ![]() | -8 | F | -3 | 69 | 68 | 68 | 67 | 272 |
| 32 | WATANABE, Tsukasa | ![]() | +11 | F | -2 | 75 | 75 | 73 | 68 | 291 |
| 20 | PAVIN, Corey | ![]() | +8 | F | -2 | 72 | 75 | 73 | 68 | 288 |
| 18 | SINDELAR, Joey | ![]() | +7 | F | -2 | 74 | 71 | 74 | 68 | 287 |
| 8 | MIZE, Larry | ![]() | +3 | F | -2 | 74 | 69 | 72 | 68 | 283 |
| 38 | SUTTON, Hal | ![]() | +12 | F | -1 | 73 | 77 | 73 | 69 | 292 |
| 12 | LEHMAN, Tom | ![]() | +5 | F | -1 | 69 | 75 | 72 | 69 | 285 |
| 53 | BRITTON, Bill | ![]() | +17 | F | E | 76 | 73 | 78 | 70 | 297 |
| 32 | PURTZER, Tom | ![]() | +11 | F | E | 72 | 75 | 74 | 70 | 291 |
| 32 | JACKSON, Tim | ![]() | +11 | F | E | 68 | 79 | 74 | 70 | 291 |
| 28 | SPITTLE, Rod | ![]() | +10 | F | E | 75 | 74 | 71 | 70 | 290 |
| 24 | SLUMAN, Jeff | ![]() | +9 | F | E | 73 | 74 | 72 | 70 | 289 |
| 18 | WIEBE, Mark | ![]() | +7 | F | E | 73 | 72 | 72 | 70 | 287 |
| 12 | LEWIS, J. L. | ![]() | +5 | F | E | 72 | 70 | 73 | 70 | 285 |
| 2 | COUPLES, Fred | ![]() | -5 | F | E | 70 | 70 | 65 | 70 | 275 |
| 51 | PARKER , Rich | ![]() | +16 | F | +1 | 72 | 77 | 76 | 71 | 296 |
| 43 | GOODES, Mike | ![]() | +14 | F | +1 | 73 | 75 | 75 | 71 | 294 |
| 43 | TRITTLER, Paul | ![]() | +14 | F | +1 | 77 | 73 | 73 | 71 | 294 |
| 40 | GILDER, Bob | ![]() | +13 | F | +1 | 75 | 74 | 73 | 71 | 293 |
| 32 | RUTLEDGE, Jim | ![]() | +11 | F | +1 | 73 | 74 | 73 | 71 | 291 |
| 12 | MORSE, John | ![]() | +5 | F | +1 | 72 | 74 | 68 | 71 | 285 |
| 6 | ALLEN, Michael | ![]() | +2 | F | +1 | 69 | 71 | 71 | 71 | 282 |
| 6 | SENIOR, Peter | ![]() | +2 | F | +1 | 73 | 70 | 68 | 71 | 282 |
| 53 | WATSON, Denis | ![]() | +17 | F | +2 | 79 | 71 | 75 | 72 | 297 |
| 40 | HALLBERG, Gary | ![]() | +13 | F | +2 | 73 | 77 | 71 | 72 | 293 |
| 28 | COCHRAN, Russ | ![]() | +10 | F | +2 | 75 | 69 | 74 | 72 | 290 |
| 24 | HART, Jeff | ![]() | +9 | F | +2 | 73 | 72 | 72 | 72 | 289 |
| 17 | ROTH, J. R. | ![]() | +6 | F | +2 | 73 | 66 | 75 | 72 | 286 |
| 63 | MARSH, Graham | ![]() | +21 | F | +3 | 74 | 76 | 78 | 73 | 301 |
| 60 | LAWRENCE, Mike | ![]() | +19 | F | +3 | 77 | 73 | 76 | 73 | 299 |
| 58 | MASON, James | ![]() | +18 | F | +3 | 75 | 72 | 78 | 73 | 298 |
| 58 | JONES, Gene | ![]() | +18 | F | +3 | 78 | 71 | 76 | 73 | 298 |
| 48 | THOMSEN, Jeff | ![]() | +15 | F | +3 | 75 | 73 | 74 | 73 | 295 |
| 48 | STADLER, Craig | ![]() | +15 | F | +3 | 74 | 75 | 73 | 73 | 295 |
| 43 | JOHNSON, Mark | ![]() | +14 | F | +3 | 75 | 72 | 74 | 73 | 294 |
| 40 | POOLEY, Don | ![]() | +13 | F | +3 | 72 | 73 | 75 | 73 | 293 |
| 32 | TWAY, Bob | ![]() | +11 | F | +3 | 73 | 75 | 70 | 73 | 291 |
| 28 | ROMERO, Eduardo | ![]() | +10 | F | +3 | 71 | 72 | 74 | 73 | 290 |
| 20 | OZAKI, Joe | ![]() | +8 | F | +3 | 69 | 73 | 73 | 73 | 288 |
| 12 | SIMPSON, Scott | ![]() | +5 | F | +3 | 70 | 71 | 71 | 73 | 285 |
| 11 | ARMOUR III, Tommy | ![]() | +4 | F | +3 | 71 | 68 | 72 | 73 | 284 |
| 8 | KITE, Tom | ![]() | +3 | F | +3 | 72 | 69 | 69 | 73 | 283 |
| 8 | LU, Chien Soon | ![]() | +3 | F | +3 | 71 | 71 | 68 | 73 | 283 |
| 63 | FIEDLER, Jon | ![]() | +21 | F | +4 | 75 | 74 | 78 | 74 | 301 |
| 53 | HATALSKY, Morris | ![]() | +17 | F | +4 | 77 | 72 | 74 | 74 | 297 |
| 51 | CHANCEY, Jim | ![]() | +16 | F | +4 | 73 | 75 | 74 | 74 | 296 |
| 48 | FLEISHER, Bruce | ![]() | +15 | F | +4 | 77 | 69 | 75 | 74 | 295 |
| 38 | DOYLE, Allen | ![]() | +12 | F | +4 | 72 | 76 | 70 | 74 | 292 |
| 28 | REID, Mike | ![]() | +10 | F | +4 | 74 | 70 | 72 | 74 | 290 |
| 24 | FERGUS, Keith | ![]() | +9 | F | +4 | 71 | 73 | 71 | 74 | 289 |
| 20 | HAAS, Jay | ![]() | +8 | F | +4 | 70 | 73 | 71 | 74 | 288 |
| 65 | SAUTTER, Bill | ![]() | +23 | F | +5 | 73 | 77 | 78 | 75 | 303 |
| 53 | MORGAN, Gil | ![]() | +17 | F | +5 | 76 | 74 | 72 | 75 | 297 |
| 43 | ROY, Jim | ![]() | +14 | F | +5 | 76 | 73 | 70 | 75 | 294 |
| 32 | SANCHEZ, Javier | ![]() | +11 | F | +5 | 71 | 71 | 74 | 75 | 291 |
| 24 | CALCAVECCHIA, Mark | ![]() | +9 | F | +5 | 69 | 73 | 72 | 75 | 289 |
| 67 | GRACE, John | ![]() | +25 | F | +6 | 74 | 75 | 80 | 76 | 305 |
| 60 | NUCKOLLS, Rod | ![]() | +19 | F | +6 | 73 | 77 | 73 | 76 | 299 |
| 43 | FUNK, Fred | ![]() | +14 | F | +6 | 76 | 70 | 72 | 76 | 294 |
| 20 | ROBERTS, Loren | ![]() | +8 | F | +6 | 68 | 72 | 72 | 76 | 288 |
| 53 | VAUGHAN, Bruce | ![]() | +17 | F | +8 | 66 | 82 | 71 | 78 | 297 |
| 65 | WEST, Ralph | ![]() | +23 | F | +10 | 71 | 75 | 77 | 80 | 303 |
| 62 | FROST, David | ![]() | +20 | F | +10 | 76 | 72 | 72 | 80 | 300 |
| 68 | HUDSON, Steven | ![]() | +27 | F | +11 | 73 | 75 | 78 | 81 | 307 |
| 69 | NIGER, Bob | ![]() | +30 | F | +15 | 77 | 73 | 75 | 85 | 310 |