Martinez's right knee problems aren't a new thing. He's dealt with the issue over much of his career.
DeFrancesco said he liked how Martinez, 23, was evolving into a possible everyday Major League hitter. Martinez is hitting .231/.290/.418 this season. Since DeFrancesco took over as manager, Martinez is batting .298 with two homers and five RBIs in 18 starts.
"Unfortunately, if his knee can't go, it kind of changes the situation," DeFrancesco said.
Jimmy Paredes started in right field in Sunday's 7-6 win over the Phillies, batting second. Scott Moore, originally batting second, hit third, Martinez's spot in Sunday's lineup.