Nadal, who is the clear tournament favourite and looks to be in the form of his life on clay this season, raced into a 3-0 lead before Spanish compatriot Almagro felt his left knee with less than half an hour played.
Unseeded Swede Simon Aspelin and Paul Hanley of Australia captured their second ATP World Tour team title on Saturday evening, beating second seeds Leander Paes of India and Lukas Dlouhy of the Czech Republic 6-2, 6-3 in the final of the Barclays Dubai Tennis Championships.
Top seed Maria Sharapova delivered an enigmatic performance but still advanced to the quarter-finals of the Auckland Classic with a 6-3, 7-5 victory over Renata Voracova of the Czech Republic on Wednesday.
A round-up of tennis matches played on Tuesday.
US tennis powerhouse Serena Williams dispatched France's Alize Cornet in two sets on Monday, ending a streak of weak family performances that saw older sister Venus eliminated from singles on Saturday and the pair knocked out in doubles on Sunday.
He will take up his new appointment in September, it was officially announced in London on Wednesday.
'It is less dependent on imported capital.'
Serbia's world number one Novak Djokovic will return to Davis Cup action after a season's absence when he leads his country against Croatia in the first round in March, he said on Wednesday.
A summary of Saturday's action at the US Open.
Holders France got their World Cup qualifying campaign off to a disappointing start with a 1-1 draw at home to Ukraine
Seedings for the June 23-July 6 Wimbledon men's singles championship were announced on Wednesday.
Readers Narasingam, Srinivas B and Srinivas P spotted Mukesh Ambani, chairman nad managing director of Reliance Industries, in Prague, capital of the Czech Republic.
German carmakers Audi, BMW and Skoda launched their dazzling new models at the Auto expo, in New Delhi, on Tuesday.