Grigor Dimitrov posted a straight-set upset victory Tuesday in second-round play at the Monte Carlo Rolex Masters tennis tournament.
Tommy Robredo and John Isner each won ATP tournaments last week but only Robredo saw a change in his world ranking.
Andy Murray, David Ferrer and Richard Gasquet all improved their standing in the men's world tennis rankings, which were updated Monday.
Tommy Haas was solid on the serve Tuesday and upset defending champion Novak Djokovic of Serbia 6-2, 6-4 at the Sony Open in Miami.
Top-seeded Novak Djokovic and No. 3 David Ferrer each knocked out a straight-set victory in third-round play Sunday, advancing at the Sony Open in Miami.
Rafael Nadal collected a record 22nd ATP Masters trophy after winning his third consecutive tournament of 2013 and improving his world tennis ranking.
Ernests Gulbis joined Novak Djokovic and Rafael Nadal in the latest ATP winner's circle and made a strong move in the men's world tennis rankings.
World No. 1-ranked Novak Djokovic rolled through a first-round win Tuesday at the Dubai Duty Free Tennis Championships.
David Ferrer repeated his title at Buenos Aires and goes for a fourth consecutive championship this week in Mexico, looking to protect his world No. 4 ranking.
Juan Martin del Potro managed just one break Thursday but still won a three-set, second-round match at the Open 13 tennis tournament in France.