Valentin Vacherot, seeded eighth at the Tokyo ATP tournament, defeated Stefanos Tsitsipas in a tightly fought three-set match on October 2, 2026, with the score 4-6, 7-6(5), 6-4. The match was marked by intense competition, with Vacherot overcoming the challenge of being down a set and a break. His resilience was key in turning the match around, particularly in the second set, which went to a tiebreak after both players scored six games each. Vacherot had already shown strong form earlier in the tournament, defeating Alexander Blockx in two sets, 7-6(2), 7-6(4), to advance to the second round. This victory over Tsitsipas is significant, as it marks Vacherot's first win against the former world number three, who is known for his powerful baseline play and consistency on the ATP tour. Tsitsipas, who had previously won the Shanghai Masters 1000 title the year before, had been expected to advance further in the tournament. However, Vacherot's performance demonstrated his ability to compete at the highest level, particularly on hard court surfaces. The French player's success in Tokyo adds to his growing reputation on the international tennis circuit. Vacherot will now face the winner of the match between Arthur Fils and Frances Tiafoe in the quarterfinals. This upcoming match will be another crucial test for Vacherot as he aims to continue his strong performance in the tournament.