Roddick defeated Tommy Robredo while Srichapan ended the run of 17-year-old Rafael Nadal.
Sixth seed Andy Roddick was sent packing by South African Kevin Anderson 6-4, 7-5 in the first round of the men's draw at the China Open on Monday after an unavailing series of last gasp match point saves.
The American recorded his first win over the world number one since August 2003 to gain a huge psychological boost before the Australian Open.
Andy Roddick took out his frustrations on Frenchman Paul-Henri Mathieu on Sunday to seal a place for the United States in the Davis Cup semi-finals, where they will take on Spain. Russia and Argentina will contest the other semi-final in September after wrapping up their ties with a match to spare.
Fifth seed Nikolay Davydenko beat Briton Andy Murray 7-5 6-4 to reach the semi-finals of the Dubai Championships on Thursday.
Defending champion Andy Roddick weathered an early onslaught from hard-hitting Ukrainian Alexandr Dolgopolov before steamrolling him 6-4 6-1 to book a quarter-final place at the Brisbane International on Wednesday.
The American had a bumpy ride into the quarter-finals at Queen's, getting past wildcard Alex Bogdanovic 4-6, 7-6, 6-4.
Novak Djokovic and Andy Roddick won in straight sets on Wednesday to march into the third round of the Paris Masters.
Third seed Andy Roddick lost 6-0, 6-4 to last 16 opponent Juan Ignacio Chela.
The Swiss defending champion unleashed an unstoppable barrage of winners to shatter the American sixth seed and book a place in a record-equalling seventh consecutive Grand Slam final
Mardy Fish extended his winning streak to nine matches by defeating top seeded Andy Roddick 7-6, 6-3 on Saturday to advance to the final of the Atlanta Tennis Championships.
As Andy Roddick walked off Wimbledon's Centre Court after his third-round defeat by David Ferrer on Saturday, he blew a kiss and waved to the crowd in a manner which suggested the three-times runner-up might not be returning.
The top seed, watched by his new coach Jimmy Connors, unleashed nine aces in an easy win over South African Rik de Voest.
Andy Roddick can emulate Andre Agassi and enjoy his greatest success in the latter years of his career, his coach Larry Stefanki said after watching the American win the Sony Ericsson Open on Sunday.
Defending champion Andy Roddick was pushed for the second straight day before prevailing over Lu Yen-hsun 7-6, 6-4 on Thursday during the second round of the Memphis Championships.
Top seed Andy Roddick out-muscled Tomas Berdych 7-6, 7-6 in a tight contest to earn a place in the final four of the $530,000 San Jose Open on Friday.
American brothers Bob and Mike Bryan were named ITF men's doubles champions.
Sweden's Robin Soderling will replace Andy Roddick in the ATP World Tour finals after the American pulled out with a knee injury on Tuesday.
Andy Roddick defeated French wildcard Thierry Ascione in the first round of the Lyon Grand Prix.
Andy Roddick put USA's Davis Cup win over Russia on par with his 2003 US Open title
A thunderbolt serve, a peerless recent record and a celebrity girlfriend have turned the American into hot property.
The world No. 1 came from behind to beat Andy Roddick 3-6, 6-3, 6-4 in the U.S. Clay Court Championships final on Sunday.
Czech Radek Stepanek beat top seed and defending champion Andy Roddick 3-6, 7-6, 6-4 to reach the San Jose Open final on Saturday.
Andy Roddick and Serena Williams scored contrasting wins to enter the Australian Open quarterfinals.
American ace Andy Roddick, ranked sixth, believes Spaniard Nadal's reputation as a powerful baseline player camouflages his improved skills around the court.
But defending champion, Andre Agassi at 33 years is still the man to beat.
The American stands a few points behind Juan Carlos Ferrero in the ATP entry ranking system.
The world number one says he is going into the new season full of confidence after "a dream year" in 2003.
Andy Roddick used his big serve to overcome Austrian Juergen Melzer 7-6 7-6 4-6 6-3 to reach the fourth round of Wimbledon on Saturday.
Andy Roddick has decided to miss this year's Olympic Games in Beijing to defend his Washington Open title.
The American said he is feeling quietly confident about his chances of winning the Australian Open.
Andy Roddick will use the confidence he gained by reaching last month's Wimbledon final to fuel his bid for the U.S. Open title, the American said on Monday.
Andy Roddick and Guillermo Coria raced into the fourth round with crushing victories.
Monfils, a wild-card entry at the Austrian event, will next face fourth seed Lleyton Hewitt after the Australian demolished Argentina's Diego Hartfield 6-2 6-2.