さすが
just as you'd expect (admiring); even (X)
さすが + Noun · さすが(は)〜だ · さすがに
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さすが praises someone or something for living up to their reputation: さすがプロだね, "just what you'd expect from a pro". It's admiration, and it's very common as a compliment: さすがですね!
After さすが, the noun names what they are that explains the quality: さすが先生, さすが日本の電車.
さすがに is different: it means "even (someone like me), as you'd expect": さすがに今日は疲れた, "even I'm tired today". It admits a limit has been reached, and it's often used with negatives: さすがにそれは無理だ, "that really is too much, even for me".
Compare やはり/やっぱり ("as expected"), which is neutral. さすが adds respect.
Examples
さすがプロだね。上手だ。
Just what you'd expect from a pro. So good.
さすが先生、何でも知っている。
Just what you'd expect from a teacher. They know everything.
優勝するなんて、さすがですね。
You won the championship? Impressive, as always.
さすがに今日は疲れた。
Even I'm tired today.
さすが日本の電車は時間に正確だ。
Japanese trains are punctual, just as you'd expect.