World No. 1 Carlos Alcaraz weathered a rain delay and an injury scare to defeat Argentina's Sebastian Baez 6-4, 6-2 in the first round of the Japan Open on Thursday in Tokyo.

The top-seeded Spaniard stumbled to the court in the first set, clutching his left leg. After having his heel and ankle taped during a medical timeout, he powered through to the second round. Up next is Belgium's Zizou Bergs, who rallied to beat Chengdu champion Alejandro Tabilo of Chile 1-6, 7-6 (2), 7-6 (4).

No. 2 seed Taylor Fritz came from behind for a 4-6, 6-3, 7-6 (3) win over Canadian Gabriel Diallo. No. 3 Holger Rune of Denmark defeated Serbia's Hamad Medjedovic 7-6 (7), 6-1. No. 4 Casper Ruud of Norway rallied to beat Japan's Shintaro Mochizuki 4-6, 6-1, 6-1. Two seeded players fell, with Japanese qualifier

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