Britain's Andy Murray was knocked out in the second round of the European Open in Antwerp by world number 14 Diego Schwartzman.
The Argentine, 29, came from 4-1 behind to take the first set before winning a tight battle in the second to go through 6-4 7-6 (8-6).
Murray fought back from 4-2 down in the second set to force a tie-break.
Momentum fluctuated in the breaker, with Murray saving one match point before Schwartzman edged home.