The win marks the Australian Open champion's 14th singles career title.

Poland's Hurkacz and Sinner, who played together in the Halle Open doubles, each saved a break point in the first set, traded aces and held serve forcing a tiebreak which Sinner won.

The top seed had a chance to go 2-0 up in the second set but Hurkacz saved two break points as both players again held their serves before Sinner claimed the title after another tiebreak.

"It’s inspiring what you’ve been doing the last 12 months," Hurkacz told Sinner. "Jannik becoming number one in the world is really special. I try to learn from that. Big congrats."

Sinner also congratulated fifth seed Hurkacz, who won the Halle Open in 2022, for reaching another final.

"We’re very good friends off court ... seeing us play the final here is very special. Thank you so much," he said.

Sinner is preparing for Wimbledon, where he reached the semi-finals last year. The major tournament starts on July 1st.