Sara Errani's 6-0 0-6 7-6(5) victory over Venus Williams was as remarkable as the scoreline suggests.
Venus, playing in front of her home crowd in a bid to reach the fourth round of the US Open, was taken apart in the first set, but somehow managed to carve out a bagel of her own to level the match.
It could only be described as a topsy-turvy encounter, and the decider was as evenly matched as the previous two stanzas were one sided, going to a tie-breaker.
Errani, the world number 14, clinched it in thrilling fashion - but fans were left nonplussed by her celebration.
While modern tennis is not quite as genteel as it was in the amateur days, there is a certain sense of decorum that most players adopt.
Errani certainly does not have form for being provocative, making her gesture unusual, out of character.
Regardless of prior good behaviour, the Italian's reaction also doesn't really make sense.
She had beaten an American hero, and the crowd - while backing their girl - weren't singling Errani out. Not at all - there were no boos and her better winners were applauded.
Indeed, Errani even got an ovation for one point. How odd for her to then turn on the fans...
Emotions run high in tennis, but Errani would do well to remember who pays her wages - tickets for Saturday's day session start at $85 a pop...
- Sports & Recreation