Britains Robbie Grabarz bounced back from almost two years of injury hell to win high jump silver at the World Indoor Championships in Portland. The 28-year-old, who questioned his future in the sport after a knee operation in May 2014 left him jumping, in his words, like a 16-year-old girl, produced a first-time clearance at 2.33 metres to make a welcome return to the podium.Grabarz, who won Olympic bronze, European gold and the Diamond Race crown during a memorable season in 2012, could not have timed his return to form better, with the Rio Games coming up in August. It was Great Britains third medal at the Oregon Convention Center, following bronze for both Lorraine Ugen in the long jump and Tiffany Porter in the 60m hurdles on Friday, and gave the team some much-needed reason for cheer after a succession of earlier disappointments.With Qatari favourite Mutaz Essa Barshim clearly not fully fit, Grabarz was edged out of gold by Italian Gianmarco Tamberi, who needed third-time clearances at 2.29m and 2.33m before sailing over 2.36m at the first time of asking. Grabarz celebrates his silver medal on the podium Grabarzs team-mate Chris Baker saw his hopes ended by a best clearance of 2.29m and finished eighth.Erik Kynard, who took silver ahead of Grabarz at London 2012, this time finished with bronze, losing out to the Briton on countback.Grabarz said: Im ecstatic, Ive lost my voice, I just cant quite believe it to be honest.If someone said Id get that result two years ago I wouldnt have believed it, I would have bitten their hand off.They [the days of competing at the top] looked very far away and that just made me train harder. To get the reward here of being able to compete with these guys and get a medal makes it great.Before Grabarzs glorious comeback, though, the day had been going horribly wrong for Britain, with Lynsey Sharp failing to make it past the heats of the 800m and Dina Asher-Smith forced to pull out of the 60m final as a precaution due to a minor hamstring reaction after her semi-final run. Lynsey Sharp chases home Burundis Francin Niyonsaba in the 800m heats Team captain Asher-Smith was gutted after having to settle for fifth place in the 60m in 7.14 seconds.I came here for a medal, I wanted a medal. I came fifth and I didnt run a PB or a seasons best, Im gutted, she said.American Barbara Pierre shocked favourite Dafne Schippers to win 60m gold in 7.02 seconds, with her Dutch rival having to settle for second in 7.04secs.In the morning session Sharp put a positive spin on falling at the first hurdle.The European and Commonwealth silver medallist finished second in her heat, her time of 2mins 02.75secs not quick enough to progress as a fastest loser.Even though it may not look like it was a success, to me it was because Ive learned a lot, said the Scot.It all means Britain are likely to fail to win a gold medal at the biennial World Indoors for only the second time since 1997. They lay in 13th place in the medal table with one day of the championships to go.Ashton Eaton delivered the victory his hometown of Portland craved most of all by winning heptathlon gold for the third time in a row. The USAs Ashton Eaton celebrates winning the heptathlon at the IAAF World Indoor Championships in Portland Eaton followed in the footsteps of his Canadian wife, Brianne Theisen-Eaton, who claimed the pentathlon title on Friday, by finishing with 6470 points.The 28-year-old American finished 288 points ahead of Ukraines Oleksiy Kasyanov in silver.The Netherlands won a gold medal in the 1500m courtesy of Sifan Hassan who triumphed in a time of 4:04.96.American Boris Berian, a college drop-out who used to work at McDonalds, was rewarded for a bold display of front-running with gold in the 800m.Strong enough to hold on as he looked set to get caught in the final 100m, the 23-year-old was thumping his chest as he crossed the line in 1:45.83.And his team-mate Michelle Carter snatched shot put gold moments later thanks to a sixth-round throw of 20.21m.Czech Pavel Maslak retained his 400m title in 45.44, with Bahrains Oluwakemi Adekoya winning the womens event in 51.45. 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