Substitute Didier Drogba saw an injury-time penalty saved as out-of-form Chelsea were held in an absorbing 1-1 draw away to Tottenham.Heurelho Gomes palmed away the Ivorian's effort after he had felled Ramires with an untidy challenge.The Brazilian goalkeeper was earlier at fault as he spilled Drogba's fierce drive to allow the Blues to pull level.Roman Pavlyuchenko's neat control and precise finish had put the hosts ahead as Chelsea failed to threaten early on.Source: BBC