Also, Elena Rybakina makes her Top 10 debut, Magda Linette cracks the Top 30 and Ben Shelton soars into the Top 50.

The Greek player—who also pledged to build a school in Victoria with his prize money should he lift the trophy—is back into the semifinals for the third year in a row.

Plus: Three other quarterfinal plays.

Each day, we'll preview three must-see matches.

Tsitsipas has dominated his head-to-head series with Sinner, but we like the Italian to stay competitive in Melbourne.

American Brandon Nakashima has won the Next Gen ATP Finals with his second straight-set victory over Jiří Lehecka this week.

The American defeated Jack Draper, 4-3 (6), 1-4, 4-2, 4-3 (5), to go one step further than a year ago in Milan.

A year after dismissing the Swede at this very event, the No. 8 seed was five points away from being eliminated Tuesday evening.

Meanwhile, Americans Jessica Pegula and Jenson Brooksby cracked the Top 15 and Top 50, respectively.