Defending champion Roberto Bautista Agut has crashed out of the Dubai Duty Free Tennis Championships.
Last year's winner went down in three sets to Georgia's Nikoloz Basilashvili 7-6, 4-6, 3-6.
Earlier in the day, top seed Kei Nishikori was knocked out by Poland's world number 77 Hubert Hurkacz 5-7, 7-5, 2-6.
Elsewhere, Gael Monfils strolled into the quarter-finals with a 6-3, 6-2 win over 2016 runner-up Marcos Baghdatis.
Sweden's Ponsiluoma shows nerves of steel to win men's pursuit gold
Martin Ponsiluoma held his nerve and hit his final five shots to win the men's 12.5km pursuit Olympic race in spectacular fashion on Sunday to finally secure a biathlon medal for Sweden at the Winter Games.
Holder, Hope help West Indies thump Nepal, make T20 World Cup Super Eight
West Indies charged into the Super Eight Stage of the Twenty20 World Cup after the two-times champions defeated Nepal by nine wickets in Mumbai on Sunday, with Jason Holder's four-wicket haul and Shai Hope's half-century setting up the win.
Banton blitz lifts England past Scotland in T20 World Cup
England beat Scotland by five wickets in the Twenty20 World Cup on Saturday to move up to second in Group C thanks to Tom Banton's unbeaten half-century at Eden Gardens.
Tudor appointed as interim Tottenham manager until end of season
Igor Tudor will take over as Tottenham Hotspur's interim manager until the end of the season, the north London club said on Saturday, three days after Thomas Frank was sacked following a poor run of results.
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