WATCH: Danielle Collins forgets tiebreak rule, celebrates early before finally downing Karolina Muchova

WATCH: Mackenzie McDonald defeats Rafael Nadal in the 2023 Australian Open second round.

After a long day of rain delays and a grueling three-set match that crossed over into the early morning hours on Thursday, it’s no surprise that Danielle Collins was racing to get off the court.

When the 2022 Australian Open finalist finally reached match point against Karolina Muchova, she celebrated by dropping her racquet, throwing her arms up and making a ‘praying hands’ gesture in elation.

The only problem? The score was 7-3 in the tiebreak—but it wasn't a match point yet.

"I guess I haven’t played too many super tiebreaks at Grand Slams,” Collins later admitted in the on-court interview. “I was pretty embarrassed, but I just told myself, ‘It’s not like you’ve face planted on court or anything.’”

Last year's Australian Open became the first Grand Slam event to feature a 10-point ‘super tiebreak’ to decide the final set of a match—coming in the fifth set for men’s singles matches and in the third set for the rest of the field, including women’s singles. The other three Slams soon followed suit, adopting a uniform tiebreak format in March to eliminate a major source of confusion for players and fans, as each tournament previously had a different rule.

With a wry grin, Collins gamely shook off the mistake and walked back to the baseline to resume the contest. A few minutes later, the No. 13 seed finally got over the finish line—and celebrated by dropping her racquet again—after closing out the two-hour-and-56-minute marathon, 6-7 (1), 6-2, 7-6 [6].

Collins's victory sent her back into the second round in Melbourne, where 2022 Wimbledon winner Elena Rybakina awaits. The Kazakh defeated Collins in three sets in Adelaide 1 at the start of the season, 5-7, 6-2, 6-3.