Meaning of "Vamos Rafa"

I was searching for tennis blogs and then I found this blog about the spanish tennis player Rafael Nadal: http://hcfoo.com/2007/10/whats-meaning-of-vamos-rafa.html
In this blog the creator explains the meaning of "Vamos Rafa" which is a phrase in spanish that means "Come on Rafa" and he type this phrase in the back of his shoes. Also a lot of spanish and southamerican players yell "Vamos" when they win an important point or match

Berdych, Tursunov, Verdasco into Semifinals

The 24-year-old Tursunov booked his place in a fourth ATP semifinal of the season after defeating World No. 164 Yeu-Tzuoo Wang of Chinese Taipei 4-6, 6-2, 6-4 in two hours and one minute on Friday.

Tursunov, who clinched his second career ATP title at Indianapolis in July (d. Dancevic) struck 14 aces and saved five of seven break point opportunities in recording his 22nd victory of the year. It was his third career win over Wang.

Verdasco, who is placed seven spots below Tursunov at No. 36 in the South African Airways ATP Rankings, recorded his second career win over Nicolas Mahut of France 4-6, 7-6(2), 6-4 in two hours and 26 minutes on Friday.

The 23-year-old Verdasco also reached the semifinals at Kitzbuhel in July (l. to Monaco). He improves to 27-23 this year.