Keefer, who is on the cusp of earning a Masters invite via the OWGR top 50 at year's end, will compete as a sponsor exemption in Los Cabos, Mexico.
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Sinner crushes Zverev to reach Paris Masters final, brink of No.1
Jannik Sinner will replace rival Carlos Alcaraz at the top of the rankings if he beats Canada's Auger-Aliassime on Sunday.
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