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Playing in his first Australian Open at the age of 27, Baker had just won the first set in his second-round match against fellow American Sam Querrey, the 20th seed, when his body gave out on him again.
With the score level at 1-1 in the second set, he crumpled to the court after hitting a shot and shouted in pain, grasping his right knee.
While the severity of the knee injury wasn't immediately known, the setback was undoubtedly a heartbreaking one for a player who had five major surgeries in six years _ but had never had a knee problem until Wednesday.
