subsetting a data.frame in R

I am having a data frame like

players    games
-------    ------
roger     tennis
messi     football
agasi     ten开发者_如何学Pythonnis

Now I would like to get a data frame which contains only game = tennis like

player    games
roger     tennis
agasi     tennis

How can I extract the data frame contains only games = tennis using R Language?

ananth <- data.frame(players = c("roger", "messi", "agassi"), game = c("tennis", "football", "tennis"))
subset(ananth, game == "tennis")

I think you may benefit from reading An Introduction to R.