I think Yan An won the mini table tennis match. (in decisive fashion) (Causing Dan to buy the drinks in the after TT action later that night)
In the after-action mission, I believe Dan totally defeated the entire squad by himself, the CNT doesn't have the experience to defeat someone from Dan's region in that department.
Really though, drinks or no drinks, Dan is having a blast just on the professional side and any missions they do even without drink are likely to be 10x more of a blast and the stuff of legends. There probably isn't a more considerate lad around than Dan and I would bet lunch the Stiga professional staff are likewise to ensure CNT did their work and had fun too.