As many as 13 wickets fell in Kolkata as Karnataka took the opening-day honours, taking a 41-run lead with seven wickets intact after bowling Delhi out for 90 in less than a session in their Group B fixture at Eden Gardens.Stand-in captain Karun Nairs decision to bowl first was vindicated by the new ball bowlers. S Aravind, the left-arm seamer - who replaced the injured captain Vinay Kumar - triggered the meltdown, taking 4 for 12 in 11 overs as Delhi slumped to their lowest score against Karnataka. Their previous-lowest was 138 in the 2005-06 season.Aravind was complemented by Abhimanyu Mithun and offspinner K Gowtham, who returned to the state side after four years during Karnatakas season-opener last week. Mithun took two wickets, and Gowtham took three, including that of the in-form Rishabh Pant (24) who had been put down twice - once by Gowtham himself at backward point, and once by Mayank Agarwal at slip.While the surface had a green tinge, it was far from menacing as the scorecard suggested. This was in evidence as the Karnataka openers added 87. While R Samarth, coming off a double century against Jharkhand, exuded confidence in his 53, Agarwal buried flamboyance for discipline for his 56, before fending a Vikas Tokas bouncer to third slip. Karnataka ended on 131 for 3, with Nair and Mithun at the crease.The effectiveness of Karnatakas seamers may have encouraged Ishant Sharma, who was returning to competitive cricket after chikungunya kept him out for more than a month. But he was ineffective for the most part, as his length erred on the shorter side. On the odd occasions where he bowled full, he was driven comfortably. In comparison, Aravind proved that minute deviations on a helpful surface are just as effective as raw pace.Delhis only highlights came towards the ends of the day, when Robin Uthappa (5) and Agarwal (56) were caught in the slips. Saurashtras Cheteshwar Pujara (79 not out) and Sheldon Jackson (105) made Maharashtra rue their decision to bowl first in Vizianagaram. The pairs 164-run third-wicket stand helped Saurashtra recover from the loss of their openers in the first session and post 285 for 3 at stumps. Jaydev Shah, the captain, was unbeaten on 35.Jackson, who walked in to bat at 67 for 2, struck 10 fours and five sixes in his 12th first-class ton, a 155-ball 105, before Akshay Darekar, the left-arm spinner, dismissed him in the final session. Sagar Jogiyani (24) and Avi Barot (28) were the other batsmen to be dismissed, falling to Rahul Tripathi and Mohsin Sayyad respectively.Ganesh Satish (93 not out) and Sanjay Ramaswamy (83) were the architects for Vidarbha, who went into stumps on Day 1 of their clash against Assam in Trivandrum on 254 for 3. The base was built during the course of a 131-run second-wicket stand between the pair, after Faiz Fazal, the captain, elected to bat. Offspinner Swarupam Purkayastha, picked up two wickets in four deliveries to briefly spark a revival, but Ganesh and Ravi Jangid ensured there was no further damage.Pankaj Singhs second five-wicket haul this season put Rajasthan in a strong position against Jharkhand in Vadodara.Kaushal Singh top scored with 56 in Jharkhands 209 all out after electing to bat. Kaushals 96-run sixt-wicket stand with Ishank Jaggi (49) helped Jharkand climb out of a hole at 69 for 5. 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According to a report from the Winnipeg Free Press, the Bombers will name Acting GM Kyle Walters to the post full time.Great Britains Alistair Brownlee has become the first triathlete to retain an Olympic title as he led brother Jonny to a family gold and silver in Rio.The brothers, who finished first and third in London, did not put a foot wrong in front of packed crowds on Copacabana.It came down to a race between them and Alistair made his break on the third lap of the run, pulling away to claim a dominant victory Jonny comfortably held on for silver, making the brothers the first to finish one and two at an Olympics since Italians Piero and Raimondo DInzeo in equestrian in 1960.The final gap to Jonny was six seconds, with Henri Schoeman taking bronze for South Africa.Team GB sailors?Hannah Mills and Saskia Clark have brought their 470 partnership to a dream end by wrapping up Olympic gold.Four years on from taking silver on the home waters of Weymouth and Portland, the duo arrived in Brazil determined to go one better.It was a challenge Mills and Clark met with aplomb, producing an opening series as impressive as it was consistent to see them head into the womens 470 medal race all but assured of gold.The British duo merely had to complete the double-point medal race without disqualification and duly did so, easing home in eighth in the delayed finale to rubber-stamp glory.Marcus Ellis and Chris Langridge won Great Britains first Olympic badminton medal since 2004 -- and its first ever in the mens doubles.The pair triumphed 21-18, 19-21, 21-10 in the mens doubles bronze medal match against Chinas Biao Chai and Hong Wei at Riocentro.Ellis and Langridge won a tense opening game before the Chinese drew level when Ellis served into the net, but the British combbination stormed away with the decider and secured a podium place.ddddddddddddThe last Britons to collect an Olympic badminton medal were Nathan Robertson and Gail Emms in the Athens Games mixed doubles.Elsewhere in Kayaking, Liam Heath and Jon Schofield have claimed a silver medal for Team GB, an upgrade of the bronze medal the pair won at London 2012.The pair started impressively and maintained their pace to cross the line in 32.368 seconds.As soon as we saw it on the board, Jon absolutely went mental.?Heath said upon returning to dry land.Great Britains men angrily defended their medal prospects in the 4x100 metres relay after only sneaking into the final.Running from the inside, the quartet of Richard Kilty, Harry Aikines-Aryeetey, James Ellington and Chijindu Ujah came home third in their semifinal in 38.06 seconds.The time ranked them seventh of the eight qualifiers for the final and Ellington said they would be praying and keeping their fingers crossed for a better lane. Those prayers, though, were not answered.?It would have been 37.7secs in a better lane, said Ellington. Its (38.06s) probably the fastest time ever from lane one, so we werent playing it safe. This is the Olympics, so weve got to lay it down in the heats and the finals.Britains womens quartet of Asha Philip, Desiree Henry, Dina Asher-Smith and Daryll Neita advanced to the final in rather more comfortable fashion than the men, finishing second to Jamaica in 41.93.They will also have hopes of a medal, having broken the British record last month. ' ' '