If you are a tennis fan, 'Vamos Rafa' is definitely a familiar phrase for you.
In Spanish, the word 'vamos' means 'let's go'.
Rafael Nadal has 'Vamos' on his left shoe and 'Rafa' on his right shoe. It simply translated to 'Go Rafa'!
Other Spanish or Latin players shout 'vamos' whenever they win a point too.