Jannik Sinner said it "means a lot to me" after he became the youngest man to complete the set of hard-court trophies with victory over Daniil Medvedev in the Indian Wells final.
World number two Sinner saw off the resurgent Russian 7-6 (8-6) 7-6 (7-4) in a match lasting just under two hours in baking conditions in California.
Sinner has won both hard court Grand Slams, triumphing at the Australian Open in 2024 and 2025 and at the US Open in 2024.
The 24-year-old has also lifted all six Masters 1,000 titles on hard courts - adding the Indian Wells title to victories in Miami, Toronto, Cincinnati, Shanghai and Paris - and the season-ending ATP Finals.