ROME (AP) — It’s not just Grand Slam titles that Jannik Sinner and Carlos Alcaraz have taken turns collecting this year.

The top two tennis players are also trading the No. 1 ranking back and forth.

Sinner officially returned to the top spot in the ATP rankings on Monday following his Paris Masters victory — replacing Alcaraz, who had held the honor for nearly two months.

But due to the rankings’ math and rules, Alcaraz will return to No. 1 next Monday.

The Italian and the Spaniard are separated by so few points now — Sinner leads with 11,500 points to Alcaraz’s 11,250 — that it will come down to their performances at the upcoming ATP Finals in Turin to determine who ends the year at No. 1.

Points dropping off

While neither Sinner nor Alcaraz are playing this week — except for

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