3 seed Frances Tiafoe won two tiebreakers to complete a 3-6, 7-6 (4), 7-6 (2) comeback win over Swedish wild card Elias Ymer in the second round of the Stockholm Open on Thursday in Sweden.
Despite Ymer winning 47 of his 59 first-service points (80 percent) and holding a 20-11 advantage in aces, Tiafoe controlled both tiebreakers.
Second seed Felix Auger-Aliassime of Canada was spared, as he bested Frenchman Manuel Guinard 6-3, 6-3.
4 Lorenzo Musetti defeated Serbia's Laslo Djere 7-5, 6-3 to ensure two Italians reached the quarterfinals in Naples, Italy.
McDonald beat Italian qualifier Francesco Passaro 6-3, 7-5 before surprising No.