As a result of his win, Nishikori joined an elite club of players to have retained the Barcelona Open trophy. This club consists of Rafael Nadal, Thomas Muster, Mats Wilander, Ivan Lendl, Ilie Nastase and Andres Gomez.
"I’m really happy I’m able to defend the title," Nishikori said after the match. "I think the second set was extremely tough and I don’t really know how I won it to be honest.
"Pablo was very aggressive, he kept moving the ball and made me run up and down all the time. "
However, even though Nishikori thought that Andujar played better than him, the 25-year-old pointed out that his more aggressive style of play did the trick in the end.
"I also tried to be aggressive and I think that’s why I won the important points, but I’d say he played better than me," he said. "I knew Pablo was a great player. I watched yesterday’s match so I knew it wouldn’t be easy to beat him. It wasn’t my best match, I wasn’t at 100% but I think it’s important I won in two sets."
Nishikori is now looking to build on his clay-court success prior to the French Open, which gets underway on May 24.
"I think this victory on clay and in such a difficult tournament gives me a lot of confidence to face the upcoming competitions," he said. "It's just an amazing feeling to win a title. I have to come back to Barcelona."