Caption This: Davis Cup highs and lows

(Dai Zhenhua/Zumapress) On the site of one of his greatest triumphs, Novak Djokovic left in tears. ***** (Marko Drobnjakovic/AP) Argentine captain Tito

(Dai Zhenhua/Zumapress)

On the site of one of his greatest triumphs, Novak Djokovic left in tears.

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(Marko Drobnjakovic/AP)

Argentine captain Tito Vazquez.

I think he's celebrating. I can't really be sure. I don't think Team Argentina knows either.

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(Sergio Torres/AP)

Boy, Adidas sure is stretching the limits, huh?

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(Yves Logghe/AP)

Jurgen Melzer, U.S. Open doubles champ, leading his Austrian team to victory.

I sure hope that was match point.

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(Ariel Schalit/AP)

Vasek Pospisil, Prime Minister of Canada.

Take a nap, kiddo. You earned it.