Top seed Marin Cilic has been knocked out of the Japan Open in the first round after losing to Jan-Lennard Struff 3-6 6-4 7-6 (7-1).
Eighth-seeded Richard Gasquet and three-time Grand Slam champion Stan Wawrinka also advanced to the second round, both by beating American opposition.
Frenchman Gasquet defeated Denis Kudla 7-6 (10-8) 6-3 while Swiss Wawrinka beat Taylor Fritz 6-3 6-4.
American Frances Tiafoe beat Maximilian Marterer in straight sets 7-5 6-4 and Jeremy Chardy defeated Damir Dzumhur 4-6 6-3 6-3.
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