The eight-time Grand Slam winner and Olympic gold medallist only began coaching Djokovic last season ahead of the French Open, ending 11 years away from the sport.
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Seven-time Grand Slam winner Williams went a break down in the first set as American Collins raced to a 3-0 lead, and saved two set points at 5-2 but lost the third after 39 minutes.
She lost her first match since January on December 30, falling 6-2, 3-6, 10-5 to Latvian Jelena Ostanpenko in an exhibition match in Abu Dhabi.
Williams claimed a 23rd grand slam title at last year’s Australian Open before hanging up her racket for the season upon discovering she was pregnant with her first child.
The Serb arrived in Australia with question marks over his elbow injury and has played two rounds in Melbourne wearing a compression sleeve on his serving arm.
The 36-year-old, who gave birth to her first daughter Alexis Olympia in September, decided to pull out of the Australian Open following concerns over her ability to make an impact in Melbourne.
He was scheduled to kickstart the new season against Roberto Bautista Agut, but was advised by his medical team to skip the tournament just hours before the match.
The 12-time Grand Slam winner was forced to withdraw from his quarter-final clash with Thomas Berdych at Wimbledon.
The Spaniard, who has won the Grand Slam at Flushing Meadows twice before, sealed a 6-2 6-4 6-1 victory in one hour and 42 minutes
“It’s too sore for me to win the tournament and ultimately that’s what I was here to try and do,” Murray said at a press conference on Saturday.
The 23-time Grand Slam winner is going through her 35th week of pregnancy, but is still hitting the gym as you can see from the two photos published on her Snapchat account at the weekend.
“I’m happy to be coming back to Montreal, as I have not had the chance to play there for many years,” said Federer in a statement released by Tennis Canada.
It gave Britain two men in the fourth round of a Grand Slam for the first time since 2002
The 34-year-old from Russia concludes a career which saw her clinch 13 WTA singles and 24 WTA doubles titles, reach a Grand Slam singles semifinal, advance to two Grand Slam doubles finals and win the WTA Finals doubles title on two occasions
The 31-year-old overcame Djokovic in four sets after initially losing the first, seeing the match out 6-7, 6-4, 7-5, 6-3 early on Monday morning