
Del Potro, who had not dropped a set all week, was unable to hold serve once in the first set as the Spaniard fought his way to a 6-1, 4-6, 7-5 win.
Murray doubt for Australian Open
Both players are seeded in the Australian Open with del Potro 12th and Bautista Agut 20th but it was the Spaniard who was in command in Auckland.
He targeted the Argentinian's backhand with confidence and when he switched to the forehand court del Potro's return placement was off in the first set.
But in the second set del Potro regained his touch and broke Bautista Agut for the first time at 5-4 to take the set.
The final set remained with serve until Bautista Agut broke at 5-5 and then served for the match.
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