Serena Williams delays retirement with win on electrifying opening night at US Open

Serena Williams delayed her farewell to tennis on an electrifying opening night at the US Open on Monday as the sporting icon battled to victory in front of a star-studded crowd.

The 23-time Grand Slam winner - who earlier this month signalled she plans to retire from tennis after the tournament - drew on all of her experience to down lowly ranked Montenegrin opponent Danka Kovinic 6-3, 6-3.

A galaxy of celebrities ranging from Hollywood stars, fashion icons and former presidents were out in force at Flushing Meadows' Arthur Ashe Stadium to watch could have been Williams final appearance in a Grand Slam singles match.

But the 40-year-old ensured that her legions of fans will have at least one more chance to savour her talents as she dug out victory despite an error-strewn display.

"I feel so comfortable on this court and in front of everyone here," a jubilant Williams said after her victory.

"The crowd was crazy - they really helped pull me through. I was really pumped," added Williams, who won the first of her Grand Slam titles in the same arena in 1999 as a 17-year-old prodigy.

Williams admitted that deciding to walk away from the sport after 27 years as a professional was "such a hard decision."

"I think when you are passionate about something it is always hard to walk away," she said. "I have been trying to decide what to do. I love this game.

"But I was just like 'Alright, I think now's the time'. I have a family, there's other chapters in life. I call it evolution."

Williams later refused to be definitive about her retirement however when asked if the US Open would be her last tournament, teasing the possibility that she may yet play on.

"I've been pretty vague about it, right?" she said. "I'm going to stay vague because you