Argentine clay court specialist Coria failed to make an impression on grass and was dumped in the first round at Wimbledon.
Andy Roddick swept to his first grasscourt title on Sunday after thrashing Sebastien Grosjean 6-3, 6-3.
The 33-year-old's win over Xavier Malisse in the Stella Artois Championships vaulted him to the top.
The second seed was shocked by seventh seeded Argentinian Guillermo Coria in the quarter-finals of the French Open.
Coria overcame compatriot Mariano Zabaleta in five sets to set up a French Open quarter-final with the US ace.\n\n
The women's top seed won at love against Barbara Schett while Agassi beat Xavier Malisse at the French Open.
The 32-year-old continued the form that has brought him 22 victories in 23 matches this year, to reach the final of the U.S. Clay Court Championships on Saturday.
The Thai ace is the first Asian man in the top 10 since rankings were introduced in August 1973.
Andre Agassi rallied from a set down to edge out Alex Calatrava and advance to the quarterfinals in Houston
Sweden's Thomas Enqvist showed the American ace the door in the Scottsdale Classic.
The American ace overwhelmed Italian Davide Sanguinetti in a one-sided final.
The Australian Open champion fought off a match-point to beat Vladimir Voltchkov and book his spot in the semi-finals of the San Jose Open.
Chang had no answer to Agassi's thunderous attack from inside the baseline in the San Jose Open.
The American beat Radek Stepanek 6-4, 7-5 in the first round of the Dubai Open.
Agassi said his wife agreed to play mixed doubles with him at the French Open if he wins his fourth Australian Open.
Andre Agassi paid tribute to his vanquished opponent, after toiling to a 6-2, 3-6, 6-3, 6-4 victory.
The former swept past Svetlana Kuznetsova while Agassi bulldozed fellow-American Brian Vahaly in the first round of the Australian Open.
The American has already sent a warning to Lleyton Hewitt, beating Frenchman Sebastien Grosjean 6-2, 6-3 to win the Kooyong Classic
The first and third seeds were beaten by Tommy Haas and Cyril Saulnier respectively in the quarter-finals of the Mercedes-Benz Cup.
He is the sixth American and just the 13th player in the history of the ATP rankings to finish the year at the top.
Andre Agassi and Andy Roddick stayed on course for an all-American U.S. Open final.
Agassi was beaten by Chilean Fernando Gonzalez while Roddick lost to Tim Henman in the semis.
The 47-year-old agreed to coach Djokovic, who has been through a crisis of confidence since winning his 12th major title at the French Open last year, last month.
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