Juan Martin del Potro began his season with a comfortable victory over Canadian Denis Shapovalov in the Round of 16 at the Auckland Classic on Wednesday.
"I had luck to break his serves twice and that's it, then I held my serve in all the second set, saving break points, playing good tennis down the line, and I had to take a risk playing against David because he's a fighter", del Potro said. "We played a great match".
"It's tough every week but I think it's possible to do it".
The second-seeded del Potro will aim for his first Classic title since 2009, while the fifth-seeded Bautista Agut will seek his second crown in three years.
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However, the tall Argentine has battled with serious wrist injuries since 2014 and had to rehabilitate from four surgeries, but showed that his forehand, especially the ability to clinch winners on the run, will be a big threat in Melbourne.
"It's unbelievable to me just to be playing tennis against after all my wrist problems".
"It's wonderful to me to be playing tennis again after my wrist problems", Del Potro added.
Bautista Agut coasted into Friday's semi-finals with a 7-6 (7-1) 6-2 win over Czech Jiri Vesely, while Haase trumped giant-killing German Peter Gojowczyk.
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"Unfortunately the match can't have two winners", an exhausted Bautista Agut said after the two hour, 52 minute clash.
"It was a great finish and when I saw that last ball in I went insane", Bautista Agut said.
"I passed very bad moments on the court and that moment I screamed because I was very stressed".
"I didn't have my best serving day which didn't help, got some free points but not as many as I'd like - it's a rusty first match, you've got to get the cobwebs off".
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