The signed helmet read, "Best wishes for your comeback season"
Mattek-Sands, letting out an audible scream in an Instagram video produced by Women's Tennis Association, said, "You've always been an inspiration to me. I believe in you and I feel like you believe in me too."
The 36-year-old Mattek-Sands, a native of Rochester, Minnesota, suffered a devastating knee injury at Wimbledon in 2017, dislocating her kneecap and rupturing her patellar ligament.
Before the injury, she was the world's number one doubles player winning both the Australian and French Opens.
She appreciated the support from Rodgers and she also made sure to wish him good luck in his comeback season.
"Listen, I am a Packers fan wether we are winning or losing and I feel like right now it always comes down to Aaron Rodgers," she said. "We are doing well if he's playing well and healthy...C'mon Aaron, you got this."
Rodgers broke his collarbone after being hit by Anthony Barr in a week four tilt with the Vikings last year. He missed 8 weeks before returning for week 14 against Carolina. It was the second time he broke his collarbone in his career.
Mattek-Sands is a true Packers diehard. In her Olympics bio, she listed watching the Packers as one of her main hobbies and says her husband, Justin Sands, is a Brett Favre lookalike.
But what really made her excited is that Rodgers spelled her name correctly on the helmet.