United States' Frances Tiafoe returns the ball to Germany's Jan-Lennard Struff (not in photograph) during the final match of the Stuttgart Open, in Stuttgart, Germany, on June 18, 2023. (PHOTO / AP)

Third-seeded Frances Tiafoe survived a championship point and outlasted home favorite Jan-Lennard Struff to win the Boss Open title 4-6, 7-6 (1), 7-6 (8) on Sunday in Stuttgart, Germany.

By winning his third career title and first on grass in 2 hours and 12 minutes, the 25-year-old American will move into the Top 10 in the ATP Tour rankings for the first time on Monday.

Tiafoe saved the championship point trailing 7-6 in the third-set tiebreak. He withstood 28 aces from Struff and finished with 36 winners and just four unforced errors. Struff ripped 56 winners with 13 unforced errors and recorded the match's only service break in the seventh game of the opening set.

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Home favorite and No. 6 seed Tallon Griekspoor rallied to beat Australian Jordan Thompson 6-7 (4), 7-6 (3), 6-3 to win his second career title in 's-Hertogenbosch, Netherlands.

Griekspoor saved five of seven break points and finished the 2-hour, 35-minute match with a narrow 108-107 edge in total points. The 26-year-old Dutchman won his first tournament in January at the Maharashtra Open in India.

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Thompson was denied his first singles title. Griekspoor recorded the pivotal service break in the sixth game of the deciding set.