Hamels asked for a patch in memory of Phillies chairman David Montgomery who passed away earlier this month.
Longtime Philadelphia Phillies executive David Montgomery passes away at 72
The team is wearing the emblem with the initials 'D-P-M' to honor Montgomery.
Along with his role in the Phillies front office, Montgomery gave much of his time and effort in volunteer positions at PHL Sports, a division of the Philadelphia Convention & Visitors Bureau; the Greater Philadelphia Chamber of Commerce; Need in Deed, a non-profit working with children in Philadelphia public schools; the Children's Scholarship Fund; and the Walnut Street Theatre.
Hamels credits Montgomery for sparking his own charitable spirit during his time in Philadelphia.
Hamels earned a no decision in his first game against his former team Wednesday night. The Cubs won 8-4.