Rublev dug deep in the third set and was a break ahead but Fonseca showed incredible poise and maturity at critical moments to set up another tiebreaker.
India's tryst with fourth-place Olympic heartbreaks
The US $380,000 ATP Tour event will be held at the newly-laid synthetic courts of the CCI in Mumbai, in September.
Former world number seven Mario Ancic has retired at the age of 26 to become a lawyer after years battling illness and injury.
Former world number one Marat Safin of Russia has been granted a wildcard for the Monte Carlo Masters.
Wimbledon was hit by some high-profile withdrawals on the eve of the draw, tournament organisers said on Thursday.
The Indian ace and his Croatian partner rallied from a set down to stun third seeds Jonas Bjorkman and Thomas Johansson and enter the second round.
A back injury forced the Indian ace to withdraw from the doubles draw.
Novak Djokovic looked to have regained his confidence and form just in time for a concerted Wimbledon assault as he carved out an emphatic win over Gael Monfils in the Aegon International grasscourt final at Eastbourne on Saturday.
Big Croatian Mario Ancic dispatched ninth seed Fernando Verdasco 7-6, 6-4 in the second round of the Queen's Club ATP tournament.
World number one Rafael Nadal chalked up his 11th victory in a row on Saturday, defeating unwell Frenchman Gael Monfils 6-4, 6-4 to reach the final of the World Indoor Tournament. The Spaniard next plays Britain's Andy Murray, who destroyed Croatian Mario Ancic 6-1, 6-2.
Legendary tennis coach Bob Brett says Indian tennis ace Sania Mirza must work on her fitness to become a top-20 player.
Australian Open champion Novak Djokovic overcame the distraction of two violent thunderstorms to beat Croatia's Mario Ancic 6-3 6-4 on Thursday in the quarter-finals of the Sydney International.
Leander Paes' new year and new partnership with Australian Paul Hanley began on a sour when they were beaten by Benjamin Becker and Oliver Marach in the opening round of the Next Generation Adelaide International in Adelaide on Wednesday.
The winner of the quarter-final between Bhupathi-Mario Ancic and Paes-Aisam Qureshi, who were slated to meet Gremelmayr and compatriot Simon Greul, will receive a walkover into the final.
The Indian players received two of the allotted three wild cards for the ATP event in Mumbai.
The world number one outgunned, out-thought and ultimately outclassed Croatia's Mario Ancic 6-1, 7-5, 6-4 to reach his 17th Grand Slam semi-final in a row.
Champion Roger Federer banished menacing storm clouds on Wednesday to set up a tantalising Wimbledon semi-final date with Marat Safin.
Roger Federer is unlikely to make the same mistake as in 2002, when he was stunned in Wimbledon's first round after taking lofty Croat Mario Ancic for granted.
Leander Paes and Mahesh Bhupathi went down in straight sets to the unseeded Croat-Austrian pair of Mario Ancic and Jurgen Melzer in the final of Ordina Open. The second seeded Indians, who were aiming for their first ATP title together in four years, went down 6-7 (5), 3-6.
The second seeds Indian pair beat the Argentine combine of Juan Martin Del Potro and Guillermo Canas 6-7, 6-3, 10-7 in an hour and 44 minutes in the semi-finals at 's-Hertogenbosch, the Netherlands.
Mario Ancic, on a comeback trail after dropping out of top 100, knocked out sixth seed Marcos Baghdatis 6-4, 6-2.
British number one Andy Murray stormed into the Marseille Open final with a 6-2 6-2 win over Frenchman Paul-Henri Mathieu on Saturday.
The Australian Open runner-up was beaten by Croatian wild card entrant Mario Ancic at the Marseille Open.
Top seed Nikolay Davydenko tumbled out of the St Petersburg Open in the second round, going down to Croatian qualifier Marin Cilic.
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The Indo-Czech duo was beaten 4-6, 7-6, 3-6 in the third round at the US Open.
The Indo-Croatian pair defeated Kristian Pless of Denmark and Danai Udomchoke of Thailand in straight sets in the semi-finals.
Roger Federer described his Wimbledon draw as one of the toughest of his career.
Top seed Ivan Ljubicic was the only seed to reach the quarter-finals of the Zagreb indoor tournament
Andy Roddick and Serena Williams scored contrasting wins to enter the Australian Open quarterfinals.
Seventh seed Nieminen needed 10 match points and almost three hours to subdue sixth-seeded Belgian Olivier Rochus and make the final of the Auckland Open.
Sania Mirza and Rohan Bopanna won the decisive mixed doubles to snatch a 2-1 victory in the Hopman Cup.
Tommy Robredo came from a set down to beat Mario Ancic and give Spain
Mario Ancic's defeat left only two players, American James Blake and German Tommy Haas, in contention for the last remaining slot at the season-ending Masters Cup.
Mario Ancic beat holder Thomas Johansson 7-5, 7-6 in the St Petersburg Open final to clinch his second title of the year.
The Indo-Croatian pair lost to John Stephens and Wesley Moodie in the quarter-finals of the St Petersburg Open.