In the group named after Australian star Lleyton Hewitt, Switzerland's 20-time Grand Slam victor and second seed Roger Federer is the headline name. He now stood second on the all-time list with only Jimmy Connors with 109 titles ahead of him at the moment.
In a see-saw tie-break, 25-year-old Thiem had two chances to level the match but Anderson kept his cool to seal the victory with an ace on his fourth match point.
"I don't think it matters really where I win my 100th as long as it's going to happen at one point", said Federer, who has 99 titles in his illustrious career. He went on to reach the semifinals at the U.S. Open, where he lost to Novak Djokovic.
Looking at the two player's records indoors in the last 12 months, it's also hard to split them.
Roger Federer is aiming to complete a century of titles at the ATP Finals but will likely have to find a way past the irrepressible Novak Djokovic, who is looking to round off his astonishing season in style.
Connors won his first in 1972 in Jacksonville, Fla., at age 19 and his last in 1989 at 37 in Tel Aviv. Where Anderson has an advantage is in their nine tiebreaks, winning six, but particularly when you consider two very evenly matched players, this success is quite variance-driven. "For me, if they're chasing me and my accomplishments then what else could I ask for?"
"I'm satisfied, of course (with this week)", said Djokovic in the post-match press conference in Paris last Sunday. "I'd be insane not to".
Three women have done it: Steffi Graf with 107, Chris Evert with 157 and Martina Navratilova with 167. The US Open is the most lucrative, paying its champions $3.8 million this year while the Australian Open also has a winners' pot of $2.9 million.
Helped by his trademark big serve, which reached more than 140mph, as well as several successful dashes to the net, the 32-year-old wrapped up the first set in 41 minutes when Thiem sent a forehand into the net.
For the last couple of years Federer has also chosen to skip the entire clay court season to focus on other surfaces and, understandably, does not enter as many tournaments as he used to.
The Serb has enjoyed a remarkable rise back to the top of the tennis world in 2018, becoming the first man to finish a season as world No. 1 having dropped outside the top-20 in the same year. He was deft at the net and able to consistently produce clean backhand drives despite maintaining his position very tight to the baseline.