Oklahoma senior Ryder Cowan produced an upset at the US Amateur despite arriving for his match at Merion Golf Club with only two golf balls. The situation added unusual pressure to an already demanding tournament, where losing a ball could have complicated his chances against a highly seeded opponent.

Cowan had qualified as the No. 59 seed in the 64-player match-play field after surviving a 16-man play-off for 11 available places. The US Amateur is described as the world’s most prestigious amateur golf tournament, making both his qualification and subsequent upset notable.