Argentinian soccer stud Lionel Messi -- one of the best strikers on the planet -- showed off his world cup ... in an itty bitty mankini in Cancun on Wednesday.
Messi cooled off in the water with his similarly dressed girlfriend.
The couple that shares bathing suits together, stays together.
World Cup Stud
In Bikini Battle
... with His GF
7/21/2010 4:02 PM PDT BY Johnny Lopez
Get TMZ Breaking News alerts to your inbox