Sri Lanka skipper Kumar Sangakkara has won the toss and opted to bat against Zimbabwe in their crucial group B Twenty20 cricket World Cup match at Providence Stadium in Guyana.Sri Lanka have replaced injured Muttiah Muralitharan with Suraj Randiv and have also brought in Thissara Perera in place of Chanaka Welegedara.The members of both theTeams are:Sri Lanka: Kumar Sangakkara (C), Mahela Jayawardene, Tillakaratne Dilshan, LD Chandimal, Chamara Kapugedera, Angelo Mathews, Sanath Jayasuriya, Thissara Perera, Suraj Randiv, Lasith Malinga and Ajantha Mendis.Zimbabwe: Prosper Utseya (C) Brendan Taylor, Hamilton Masakadza, Tatenda Taibu, Craige Ervine, Elton Chigumbura, Charles Coventry, Greg Lamb, Graeme Cremer, Ray Price and Chris Mpofu. Sri Lanka had lost their opening match against New Zealand.