Wildcard Feliciano Lopez has saved three match points in his upset win over Borna Coric to move into the ATP Tour's China Open second round.
Spain's Lopez began slowly and trailed 5-2 but he recovered strongly to take the first set before Croatian seventh seed Coric clawed his way back to force a decider.
The 21-year-old Coric switched gears to go 5-4 up in the third set but could not prevent a dogged Lopez from securing a 7-5 5-7 7-5 victory in two hours and 45 minutes.
British fifth seed Kyle Edmund sealed his place in the next round with a 3-6 6-1 6-2 win over Germany's Peter Gojowczyk.
Edmund fired 13 aces to progress in one hour and 31 minutes.
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Russia's Karen Khachanov powered past American Sam Querrey 6-4 6-4.
Top seed Juan Martin del Potro of Argentina, bidding for his third title of the season, begins his campaign against Spain's Albert Ramos-Vinolas on Tuesday, with the winner to face Khachanov.
Others to progress from the first round on Monday were Marton Fucsovics, qualifier Dusan Lajovic and Malek Jaziri.
