With five weeks to go before the season-ending Masters Cup, six spots in the eight man field remain up for grabs.
"Various factors led to it, things were adding up," said Bhupathi.
Mario Ancic came from two sets down to beat Fernando Verdasco 3-6, 4-6, 6-3, 6-4, 13-11 to set up a quarter-final against Roger Federer.
The world No 8 said he hopes to continue teaming with the Indian ace even after the Mumbai Open.
Mahesh Bhupathi won his first doubles title in 2006 when he claimed the China Open on Sunday with Mario Ancic.
They routed Michael Berrer of Germany and Kenneth Carlsen of Denmark on Sunday.
Cypriot Marcos Baghdatis won his first ATP title with a 6-4 6-0 victory over Croatian Mario Ancic at the China Open on Sunday.
Both players were taken to three sets by lesser-fancied opponents in the semi-finals.
The Indo-Croatian pair beat the third seeded American duo of Eric Butorac and Travis Parrott at the China Open.
The dou beat Korea's Hyung-Taik Lee and Yeu-Tzuoo Wang of Taiwan in straight sets.
The third seeds thrashed Croatian pair of Mario Ancic and Ivan Ljubicic 6-2, 6-2 in the French Open doubles event.
34-year-old Jonas Bjorkman and 21-year-old Marcos Baghdatis are the unlikely semi-finalists at Wimbledon
Roger Federer will hope the past does not come back to haunt him on Wednesday when he faces Mario Ancic in the Wimbledon quarter-finals.
The 17-year-old beat Russian Dinara Safina 6-3, 6-4 for her third career title
The two players were fined after they pushed and shoved each other after their match.
Tommy Robredo reached the final of a Masters Series event for the first time when he beat Mario Ancic 7-5, 6-4
Tommy Robredo reached the final of a Master Series event for the first time when he beat Mario Ancic of Croatia.
British number one Andy Murray won his second title of the year when he beat Croatia's Mario Ancic 6-3, 6-4 in the Marseille Open final on Sunday.
Croatia's Mario Ancic beat teenager Andy Murray 6-3, 7-6 at the Auckland Open
Mario Ancic beat Slovakia's Michal Mertinak to claim a 3-2 victory for Croatia in the Davis Cup final.
Ivan Ljubicic and Mario Ancic beat Slovakian duo Dominik Hrbaty and Michal Mertinak in the doubles to give Croatia a 2-1 lead in the Davis Cup final.
Slovakian number two Karol Beck was handed the daunting task of trying to stop Croatia's Ivan Ljubicic when the draw for the Davis Cup final was made on Thursday.
Twice champion James Blake came from behind to beat Finn Jarkko Nieminen 6-7 6-4 6-2 and book a place in the Stockholm Open semi-finals on Friday.
Former Wimbledon champion Goran Ivanisevic has withdrawn from the grasscourt grand slam with a knee injury, organisers said on Sunday.\n\n
Both nations took 2-1 leads in their semi-finals with doubles victories.
The unseeded Croatian will contest his first Grand Slam semi-final at Wimbledon against either second seed Andy Roddick or number 12 Sjeng Schalken.
Croatia's Mario Ancic beat defending champion Michael Llodra 7-5, 6-4 to win the Ordina Open.
Leander Paes and Nenad Zimonjic received a bye in the first round and would meet Nicolas Kiefer and Alexander Waske