The ball slowly went over the net and into the opposite service box, but a perplexed Kyrgios was left rooted to the spot in bewilderment, as did those present in the crowd, while the umpire called "Game, set, and match" in a 6-3 6-4 victory for Tomic.
Tomic won the exhibition 6-3 6-4, with the hit-and-giggle nature of the contest summed up best by a truly outrageous final point.
Serving for the match, Tomic bounced the ball in preparation for a regular serve before flicking an underarm shot between his legs.
Tomic delivered one of the craziest finishes ever seen in a tennis match.
But the pair faced off in a low-key matchup that served as a useful warm-up for their respective campaigns at the upcoming Australian Open in Melbourne.
Tomic's first set was nearly flawless, while Kyrgios looked a little underdone and struggled to find some rhythm early on.
With his silky hands and superb touch, Tomic broke for a 3-1 lead and then steamed through the first set.
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Kyrgios, who lost in the second round at the Brisbane International last week, had a break point early in the second but was unable to consolidate with Tomic then breaking at 3-3.
Now ranked 85, Tomic finished the year in style with an ATP title in China.
"I'll get on site at Melbourne Park, fine-tune my game a little bit and make sure the body's right".
"I think it's an exciting time for Australian tennis as we've got such a wide variety of players". However, Tomic finished the 2018 season on good terms as he won the Chengdu Open file and returned to the top-100.
"It is great to see him back out here as I know he was going through some rough times", world number 51 Kyrgios, who himself has struggled for consistency, added.