日語 Japanese Ask Questions Thread2 質問

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Japanese - Ask questions thread
http://dis.4chan.org/read/lang/1174719097/l50

Would someone care to explain what "さすが<name>！" means?

Oh, and also "なきゃ". I see this at the end of some sentences in emails I get from a Japanese person. I asked what it meant but I'm not quite sure I grasped the Japanese explanation. Is it related to "なくちゃいけません"?