Caroline Wozniacki overcame a mid-match wobble and withstood a barrage of big hitting to get her WTA Finals title defence back on track with a 7-5, 3-6, 6-2 victory over Petra Kvitova at the Singapore Indoor Stadium.
Roger Federer got his delayed hardcourt season off to a positive start with straightforward 6-3, 7-6 (7) win over Germany's Phillip Kohlschreiber to ease into the third round of the Western and Southern Open on Tuesday.
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.
Marin Cilic and Milos Raonic booked their spots in the Paris Masters second round on Monday, while Roger Federer pulled out of the tournament with next month's ATP Finals on the horizon.
A misfiring Rafael Nadal had trouble hitting the mark but the third seeded Spaniard still had enough to beat American Donald Young 6-4, 6-2 on Tuesday and advance to the fourth round of the BNP Paribas Open.
Bernard Tomic bowed out of the Australian Open on Sunday with a stinging rebuke of the scheduling.
Images from all the action on Day 5 of the Australian Open
Third seed Rafael Nadal battled through mid-match cramps for more than an hour before he lurched into the third round of the Australian Open with a 6-2, 3-6, 6-7(2), 6-3, 7-5 victory over American qualifier Tim Smyzcek.
A round-up of results from Davis Cup matches played on Saturday and Sunday
Top seed Dominic Thiem was knocked out the Rio Open in the first round on Tuesday, going down 6-3, 6-3 to Laslo Djere.
Images from the Australian Open matches played at Melbourne Park on Wednesday.
Images from Day 3 of the 2016 Australian Open in Melbourne, on Wednesday
Factbox on Serbia's Novak Djokovic and Great Britain's Andy Murray who will contest his sixth Australian Open men's singles final on Sunday.
Fifth seed Juan Martin Del Potro, whose match was shunted back to the late evening by the disruptions, was the first major casualty of the men's draw when he lostto 62nd ranked Spaniard Roberto Bautista at the Australian Open.
Olympic champion and world number one Serena Williams tumbled out of the Rio de Janeiro singles competition in the third round on Tuesday after a shock defeat to Ukraine's Elina Svitolina.
Images from matches played on Day 5 at the Australian Open in Melbourne Park on Friday
The 32-year-old, five-times a winner of the singles at the prestigious Wimbledon warm-up event, delighted a large evening centre court crowd with some fluent shot-making as he and Spanish veteran Lopez beat top seeds Juan Sebastian Cabal and Robert Farah 7-6(5), 6-3.
IMAGES from the Australian Open matches played at Melbourne Park on Wednesday
Second seed Garbine Muguruza, bidding to add the Wimbledon crown to her French Open title, was sensationally beaten in the second round on Thursday by Slovakian qualifier Jana Cepelova 6-3, 6-2 in the shock of the tournament so far.
IMAGES of the all the action from Day 1 of the Australian Open played at Melbourne Park on Monday
Images from Day 5 of the Australian Open in Melbourne on Friday.