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Mike Glennon did not prove that his recent performances were sustainable on Sunday.
During the four games prior to Sunday's defeat, Mike Glennon had his three best games as a professional quarterback. His tape against the Seahawks, Falcons, and Lions showed a quarterback with the tools to become a franchise player.
As Bleacher Report's Knox Bardeen pointed out, Glennon's statistics improved after his first four games as a pro, and that led to more success for his team. On Sunday, he had a chance to prove that he was the future of the franchise against Carolina.
Instead, he caved under the pressure of an early deficit, making some poor throws and poor decisions, as the Tampa Bay offense floundered in the second half. Glennon finished with a QB rating of 73.5, which is more in line with his early performances of the season, when he struggled to adjust to life as an NFL quarterback.
There were still positive moments for the rookie from N.C. State, but there weren't enough to help his team to victory.
The team converted only one of their 10 third downs on the day, and Glennon turned the ball over twice. The rookie still has much to prove before he can be crowned a franchise quarterback.