World No.18 Jo-Wilfried Tsonga has hit back from a set down to defeat highly-rated Russian Karen Khachanov at the Vienna Open.
The 32-year-old Frenchman looked to be heading for an early centre court exit after losing a first-set tiebreak but the eighth seed came back to seal a 6-7 (2-7) 6-4 6-3 victory on Wednesday.
The win sets up a second-round clash for Tsonga with Bosnia's Damir Dzumhur, who eased past Lithuania's Ricardas Berankis 6-4 6-2 in just 66 minutes.
The winner of that clash will take on top seed Alexander Zverev, the 20-year-old German who overcame Gilles Simon 7-6 (8-6) 6-4 and remains on course to win his sixth ATP title this year.
Compatriot Philipp Kohlschreiber became the first to seal a quarter-final berth in Austria by seeing off French qualifier Pierre-Hugues Herbert 7-6 (7-4) 6-3.
Argentine Diego Schwartzman is into to the last 16 after beating 30-year-old Italian Fabio Fognini 6-1 2-6 6-2.
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