The last PGA tour event of the year and a major mixed-martial-arts fight highlight the upcoming sports calendar. Here's what to watch this weekend:

Friday, September 20

The Tour Championship — Second Round

East Lake Golf Club, Atlanta; 1 p.m. (ET) on the Golf Channel, through Sept. 22
The last event of the 2013 PGA season happens this weekend in Atlanta, as golf's best players will crown the PGA tour champion. A points reset means anyone in the 30-man field can win the title, but Rory McIlroy is favored, with Tiger Woods also expected to be in contention.

Saturday, September 21

Tennessee at (19) Florida

Ben Hill Griffin Stadium, Gainesville, Fla. ; 3:30 p.m. (ET) on CBS
Unranked Tennessee (2-1) pays a visit to The Swamp on Saturday afternoon to face the 19th-ranked Gators. Florida (1-1) has beaten the Volunteers eight consecutive times in this SEC rivalry. Gators quarterback Jeff Driskel could be the key. After spraining his knee in the 21-16 loss to Miami two weeks ago, he may not be at full speed. Tennessee will look to take advantage.

(23) Arizona State at (5) Stanford

Stanford Stadium, Palo Alto, Calif.; 7 p.m. (ET) on Fox
The 23rd-ranked Sun Devils could put themselves in the thick of the Pac-12 race by beating the fifth-ranked Cardinal. Stanford (2-0) is led by running back Tyler Gaffney and quarterback Kevin Hogan, while Arizona State (2-0) is paced by running back Marion Grice, who has already scored six touchdowns this season.

UFC 165: Jon Jones vs. Alexander Gustafsson

Air Canada Centre, Toronto; 10 p.m. (ET) on pay-per-view
UFC light heavyweight champion Jon Jones faces challenger Alexander Gustafsson in Toronto. Jones is among the most skilled fighters in the UFC, but Gustafsson is the taller man. Undercard matches include: Renan Barão vs. Eddie Wineland; Brendan Schaub vs. Matt Mitrione; Costa Philippou vs. Francis Carmont; and Pat Healy vs. Khabib Nurmagomedov.

Sunday, September 22

The Tour Championship — Final Round

East Lake Golf Club, Atlanta; 1 p.m. (ET) on NBC
The 30-man field competes for the 2013 PGA season tour title in Atlanta.

Sylvania 300

New Hampshire Motor Speedway, Loudon, N.H.; 2 p.m. (ET) on ESPN
The Chase for NASCAR's Sprint Cup championship enters its second week, with Matt Kenseth in command. Kyle Busch, Kevin Harvick, Kurt Busch and Jimmie Johnson are all expected to contend at New Hampshire, while Jeff Gordon always performs well at the Loudon track.

Indianapolis Colts at San Francisco 49ers

Candlestick Park, San Francisco; 4:25 p.m. (ET) on CBS
Newly acquired running back Trent Richardson will make his Colts debut as Indianapolis (1-1) travels west to take on San Francisco (1-1). Niners quarterback Colin Kaepernick will look to pick apart an Indy defense that's struggled to contain Terrelle Pryor and Ryan Tannehill thus far this season.

Chicago Bears at Pittsburgh Steelers

Heinz Field, Pittsburgh; 8:30 p.m. (ET) on NBC
Quarterback Jay Cutler and the Chicago Bears (2-0) travel east to take on the winless Steelers, who are 0-2 for the first time since 2002. Pittsburgh quarterback Ben Roethlisberger will be a big target for a Bears defense that won't be scared of the ineffective Steelers offense.

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