The contests -- the hosts claimed a 3-1 victory at football, and the visitors dominated on the basketball court -- were followed by a party on board the USS Blue Ridge, the flagship of the US Navy's 7th Fleet as it paid a rare visit to the base of China's South Sea Fleet.
The fleet's frigates are charged with defending Beijing's claim to almost all the South China Sea, against several Southeast Asian neighbours including allies of Washington -- but the scene at the People's Liberation Army vessels in Zhanjiang was all smiles.
"I remembered I owed him a beer," Thomas said, before toasting a Chinese rear-admiral and cutting a cake decorated with the flags of both countries.
Chinese officers toured the hulking command ship, docked in the southern province of Guangdong, and eyed up their US counterparts over a lunch of tomato bisque and chicken paninis.
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On the Blue Ridge's main deck, US personnel patrolled with M-16 rifles a stones' throw from the palm-fringed Chinese shore, while on land staff from both navies swapped jokes and rebounds.
Those concerns -- and the M-16s -- were shunted aside in public this evening, as uniformed staff from both navies danced while a military band shook the Blue Ridge with covers of Daft Punk and hip-hop legends the Beastie Boys.
"We share the domain, we operate together," the 7th fleet's Ron Oswald told AFP when asked about South China Sea tensions.