(AP) -- Mike Tolbert's teammates affectionately refer to him as a bowling ball.
It's a fitting description for the 5-foot-9, 243-pound running back who's kept the San Diego Chargers' ground game rolling while rookie Ryan Mathews recovers from a high ankle sprain.
Tolbert has run for 609 yards and nine touchdowns, and keeps his teammates amused with his end zone dance.
It's been a pretty good season for a guy who entered the NFL as an undrafted rookie out of Coastal Carolina in 2008.
There's a chance Tolbert could finish with 1,000 yards, depending on Mathews' health and how much Philip Rivers wings it in the final five games.
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