Nick Kyrgios needs to improve his fitness to have a chance of winning Grand Slams, former world number one Jim Courier said on Wednesday.
World number 30 Berrettini saved five points in the marathon second set tiebreak and held on to win it 13-11 for his third ATP crown in last 11 months.
World No 55 Haase improved to a 2-2 career record against Zverev, including victories in their last two meetings.
Under the lights on the stadium court, Williams smashed 39 winners to defeat Azarenka 7-5, 6-3 in a rematch of the 2016 final, which the Belarusian won.
Big-serving Isner reaches Montreal second round
The match ended in 52 minutes as Williams played her forehand into the net.
Nadal, playing his first match since losing to Roger Federer in the Wimbledon semi-finals, fell behind 5-2 in the tiebreak before roaring back to prevail in his first career meeting with world number 53 Evans.
IMAGES of the all the action from Day 2 of the Australian Open played at Melbourne Park on Tuesday
A summary of Day 2 at Wimbledon on Tuesday.
IMAGES from the Australian Open on Tuesday.
A summary of sports events and sports persons, who made news on Sunday
Images from Day 5 of the French Open in Paris on Thursday.
The returning Scot also announced his withdrawal from next week's Rogers Cup in Toronto.