The most important player in this week's Davis Cup tie between the U.S. and Serbia also might be the one with the lowest profile.
Serbia's Viktor Troicki likely will be the only guy to play all three days - unless Serbia decides to insert world No. 1 Novak Djokovic into the doubles match Saturday.
Troicki ranks No. 44 in the world. He is playing two singles matches because of the unavailability of No. 10 Janko Tipsarevic, and Troicki usually plays in the Davis Cup doubles match with Nenad Zimonjic.
"We haven't decided who's going to play (doubles)," Troicki said. "Personally, I feel ready and fresh and fit to play all three days if I have to. I've been in that situation. It won't be easy, I know, but I'll give my best if I have to go on the court all three days."
Troicki has played Davis Cup for Serbia since 2008. He is 12-8 in singles (8-5 in live matches) and 4-1 in doubles.
He is 2-1 against top American Sam Querrey and 3-1 against John Isner. He split with them during a 2010 Davis Cup tie in Serbia.
"He's a world-class player," Isner said. " Just as in Novak, we're going to have to play well if we want to beat him."
Troicki won the decisive fifth match against France in straight sets as Serbia overcame a 2-1 deficit to win the 2010 Davis Cup.
On the ATP World Tour, he only has one singles title - three years ago in Moscow, Russia.
"Obviously the biggest success for our country as a team, and personally my best experience on the court, was winning that Davis Cup title," he said. "It just felt great. It gave us all a lot of confidence on the court."
That week, the Serbs were tied 1-1 after the first day and Troicki played doubles with Zimonjic.If they fall behind 2-0 this week, Djokovic might slide his way into the Saturday match. Substitutions can be made within an hour of match time.
"We'll see the result after the first day," Troicki said, "and then we'll decide."
Chadd Cripe: 377-6398,Twitter: @IDS_BroncoBeat