And, speaking ahead of his match against Dimitrov, Nadal revealed he had been talking to Murray about his injury woes.
Nishikori overcame Alexander Zverev in the second semi-final of the afternoon, with the Japanese star winning 3-6 6-3 6-4.
This is published unedited from the ANI feed.
The Spaniard, 31, has won 34 straight sets on his favoured surface after a 6-4 6-1 semi-final victory. "But, of course, things are going much better than what I thought two weeks, three weeks ago. He's one of the best players of the world, especially on clay", per The Express.More news: Supreme Court's official website hacked by suspected Brazilian hackers
"Every year is different and equally special", Nadal said after beating Dimitrov for the 11th time in 12 career meetings.
Dimitrov gave as good as he got in the opening set, fighting back from 3-0 down to level at 3-3 with excellent defence and stunning athleticism.
While Nishikori produced a spirited performance to clinch a 6-4, 6-7 (1-7), 6-3 win over Croatia's Marin Cilic in their last-eight clash, Zverev stormed into semi-finals with a 4-6, 6-2, 7-5 win over France's Richard Gasquet.
But the big-serving Croat, who needed a few minutes of massage treatment on his sore and bandaged right knee, faded in the third set as the heat lessened.More news: Amazon CEO Jeff Bezos Releases Annual Shareholder's Letter
Nadal won 66 percent of his service points and 52 percent of his return points in the victory, and he's now lost a combined 16 games in his last four matches. He said his wrist remains a "little bit sore".
But the former world number four, now ranked 36, did enough to wear down a exhausted Zverev who came through a late-night thriller with Richard Gasquet on his 21st birthday on Friday.
He won his last match against Nadal in the 2016 Olympic bronze-medal match, but has never beaten him on clay. "But, you know, to see him this week, it looks a little bit hard", added Nishikori.More news: Trump, Japan's Abe Agree to Intensify Trade Talks