You can type the name of the player at your client.
You go for example to your matchhistory/rune/mastery/whatever page. There is a small text field. Type is the name of the guy you want to see.
Then go to match history you see his last 10 games.
You can visit the statistics website of league of legends.
But the statistic of this games is delayed. I think its about 3-7days delayed gamerstatistics.
Hope i helped you.
PUR3ICE from eu west
i smell a smurf . nicely done tho good scores