Frances Tiafoe defies 'really bad' jet lag to cruise into Japan Open semis
Japan Open semifinals in straight sets on Friday, clinching each with an ace to beat Serbia's Miomir Kecmanovic 6-0, 6-4. The fourth-seeded Tiafoe faces unseeded Kwon Soon-woo of South Korea in the last four on Saturday in Tokyo. The American, who beat Rafael Nadal at the US Open on the way to his first Grand Slam semi-final, said he had been "solid from the start" of the 71-minute quarter-final.


