Australian Maya Joint has beaten Serena Williams 6-3, 6-7 (6/8), 6-3 at Wimbledon in the 44-year-old, seven-time champion's wildcard return to singles tennis after four years.Joint, playing her first match on centre court and just her second in the main draw at the grass-court slam, was clearly nervous at times, but still managed to serve the match out after a jittery deciding set by both players.While packing up her bags after the match, Joint took multiple deep breaths, clearly trying to compose herself, but was still lost for words."I really don't know what to say just now," she said."Wow, I don't really know what just happened, to be honest."The 20-year-old said after the match she was so nervous she did not remember the start, two hours and 22 minutes earlier."I didn't get much sleep last night I've been dreaming about this moment since I was a little kid, so this is pretty crazy."Williams was clearly far from her dominant best, but still found important shots when she needed them.She was broken twice in the second set and was down a match point in the tie break, but clutch serving quickly ripped Joint's chance away as the American champion pushed the match into a decider.In those moments, Joint said she felt the 23-time major winner rise to another level with the crowd behind her."The start was very nerve-racking, and then trying to finish out the match as well she definitely lifted her level and played some really great tennis there," Joint said.Williams did not speak to media after the match, with tournament organisers sending out a sole quote attributed to her."It was really great to be back at Wimbledon