Wednesday's match between US number one John Isner and Argentine Diego Schwartzman provided one of the shots of the year as the pair contested in a tightly fought match which lasted two hours and 35 minutes.
On a day that saw Rafael Nadal wrap up 2017 as the world number one with victory over Hyeon Chung, as well as number 4 seed Alexander Zverev suffering a shock defeat to Robin Haase, the Paris Masters is not letting anyone down in terms of drama.
After losing the first set 7-6 to the American, Schwartzman was leading 6-5 on serve in the second when he pulled out an outrageous behind the back shot which left even himself shocked.
Schwartzman, 25, ends the best season of his career with a 39-28 match record.
The pair, who had never previously met in a professional event, provided a hard-fought encounter but it was this one shot that will be particularly remembered.
Isner - who racked up 29 aces against the Argentine - provided one of his trademark ferocious first serves which Schwartzman managed to return, leaving Isner a simple smash to win the point.
However, the 32-year-old American surely didn't expect his opponent to miraculously return his volley from behind his back to force a winner by the right tramline.
The crowd immediately erupted and gave him a standing ovation - whilst both players could barely comprehend what had just happened.
This incredible shot spurred the world number 25 on as he went on to win the second set, defeating Isner 13-11 in another tie break.
However, his luck, or maybe skill, eventually ran out as Isner, who has reached number 9 in the world rankings, broke Schwartzman's serve early on and ended up winning the third and deciding set 6-3, thus progressing to the last 16 of the Paris Masters.
However, it's this shot by Diego Schwartzman that will be replayed over and over again on the tournament's highlight reel and won't be far off shot of the year when it comes around to it.
Isner will next face either Grigor Dimitrov or Richard Gasquet.