Kevin Anderson admitted that he was somewhat fatigued during his US Open quarter-final defeat against Stan Wawrinka on Wednesday.
Anderson advanced to the quarter-finals of one of the grand slam events for the first time by virtue of a shock victory over third seed Andy Murray in the last 16, but looked a shadow of the player who triumphed over the Scot during Wednesday’s match against the Swiss-French Open winner.
Wawrinka, the fifth seed, won 6-4, 6-4, 6-0 against the 6ft 8in (2.03m) South African in just 107 minutes.
During the third set, Anderson’s fatigue became apparent, as he won just five points en route to being bagled in 25 minutes.
Despite losing to Wawrinka, a player he beat in their previous three meetings, Anderson was satisfied with his campaign in New York City this time around.
"It was really tough out there, I was maybe a little bit nervous just with the occasion and a lot of waiting around," Anderson admitted, hinting that the rain delay prior to the match played on his nerves.
"I wasn't really making too many inroads on his serve. It just obviously wasn't meant to be today, I have got to take what I can.
"This week has been a great week for me, there are a lot of positives. I definitely know I can do better than I did today.
"My goal is always to give myself opportunities. I was able to capitalise on one of them, [a] big one, getting to the quarters in this event.
"That's definitely something I can take with me. I want to put myself in this position again – today I didn't feel like I gave myself the best shot of maybe going a little bit further."
Meanwhile, Anderson was awarded with the fifth annual US Open Sportsmanship Award following the match.
The award is handed out to the player who best demonstrates excellence in sportsmanship throughout the US Open Series and the US Open.
"Of all the players on tour, Kevin consistently ranks among those who best embody respect and sportsmanship, even in the heat of competition," said USTA Chairman, CEO and President Katrina Adams.
"He is a tremendous role model and is deserving of this year's US Open Sportsmanship Award."
Previous winners of the award are ob and Mike Bryan and Samantha Stosur (2012), Li Na and David Ferrer (2013) and Roger Federer and Caroline Wozniacki (2014).
Each award winner receives a trophy and a $5,000 donation to the charity of their choice.