The San Francisco Giants placed center fielder Angel Pagan on the 15-day disabled list Tuesday with patella tendinitis in his right knee, something he believes has been aggravated dating back to last season given all of his diving catches and plays against the wall. Pagan received a platelet-rich plasma injection in the knee. San Francisco recalled outfielder Juan Perez from Triple-A Sacramento to fill the roster spot in time for the opener of a two-game interleague series against Houston.