A day after notching the fastest win on the tour all year, Tomic claimed the prized scalp of dual grand slam semi-finalist Karen Khachanov in a straight-sets blitz in Mexico on Wednesday (Thursday AEST).
And rounding out a banner day for Australian tennis less than a month out from the US Open, world No.6 Alex de Minaur has beaten his old nemesis Stefanos Tsitsipas to set up an intriguing showdown with Cruz Hewitt in Washington.
The day, though, belonged to the resurgent Tomic.
The one-time world No.17 crushed fourth-seeded Khachanov - the big-serving Russian who ousted Nick Kyrgios to reach the 2022 US Open semi-finals - 6-2 6-4 to continue his spectacular comeback from the brink of retirement.
The 33-year-old hinted he was considering hanging up his racquet before snaring the Lincoln Challenger this month.
"I'll be as honest as I can, about 10 days ago I hit a bit of a brick wall, maybe two weeks ago," Tomic said in the aftermath of his biggest breakthrough since 2018.
"I said this was going to be my last year, so I guess I have to reassess a few things now. Now that I won, I'm going to have to go back to the table. I'm probably going to play another 20 years!"
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Twenty more years may be a stretch, but Tomic is playing some vintage tennis.
The former teenage Wimbledon quarter-finalist only made the main draw in Mexico as a qualifying lucky loser.
Now he is three wins away from hoisting the trophy in Los Cabos, having earlier needed just 46 minutes to take down Alex Hernandez 6-1 6-0 in the first round.
Currently ranked 171st, Tomic will climb even further and potentially to as high as No.132 if he wins a most unexpected fifth ATP title.
Next up in Tomic's first ATP last-eight clash since losing to de Minaur in Atlanta in 2019 is British fifth seed Cam Norrie, who defeated James Duckworth 6-4 6-4 in 92 minutes.
Another Australian in Edward Winter lost 6-3 6-4 earlier in the day to American Jenson Brooksby.
De Minaur, meanwhile, is celebrating his own big victory, after downing Tsitsipas for only the second time in 14 meetings to reach the last 16 in the US capital.
The 6-4 3-6 6-3 win earned the top seed and defending champion a first-time encounter with 17-year-old Hewitt, de Minaur's understudy and son of Australian Davis Cup captain and mentor Lleyton.
After winning his first ATP match on Wednesday, Hewitt said it would be a "dream" to square off against de Minaur, who he likened to a big brother.
"I've known him basically my whole life," said Hewitt, who made the Wimbledon boys' final two weeks ago.
"He's stayed with us and we have Christmas together, also. He's taught me so much. I think that would be a pretty cool memory for us."
Ajla Tomljanovic's dream, meantime, of featuring at another US Open is over.
The 33-year-old Australian, who hasn't played on the WTA tour since her Wimbledon exit, took to social media to inform fans of her decision not to feature at Flushing Meadows, nor again in 2026.
"Hi everyone, it's been a challenging year battling some small injuries, so I've decided to end my season early and get fully healthy and ready for 2027," the former world No.33, and current 92nd-ranked singles player, posted on Instagram.
"I hate being away from the tennis court, but don't worry I wont be too far away. I'll be around just in a different role."
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