Tiburon Peninsula residents Dan Grossman and Polo Cowan captured the men’s 55 doubles world championship in Lisbon, Portugal, Aug. 10-17. Grossman is now ranked No. 4 in the world in his men's 65 age group for doubles tennis, while Cowan is ranked No. 1 in the world for the men's 55 age group. (Elliot Karlan photo / For The Ark)
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