The Starter: Round 4, Arnold Palmer Invitational

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The fourth round of the Arnold Palmer Invitational presented by MasterCard is set to begin. PGATOUR.COM will host exclusive LIVE@ coveragestarting at 1 p.m. ET while the Golf Channel will televise live action beginning at 12:30 p.m. ET, with NBC picking up the action at 2:30 p.m. ET.

Groups we're watching:

Tee time Players   1:35 p.m. ET No. 1 Spencer Levin, Martin Laird Laird has led since Friday and will play for the second straight day with Levin, who seeks his first TOUR win. 1:25 p.m. ET No. 1 Bubba Watson, Steve Marino Will be fun to watch these two big hitters take on Bay Hill together. If Watson's putter stays hot, watch out. 1:15 p.m. ET No. 1 David Toms, Rickie Fowler No surprise to see Fowler and his Sunday orange in contention again, but Toms? He has 12 wins but none since 2006. 12:05 p.m. ET No. 1 Hunter Mahan, Phil Mickelson No threats to win Sunday, but the Ryder Cup teammates will be in full Augusta-tuning mode here and next week in Houston.

MORE ROUND 4: Tee times | ROUND 3: Wrap-up | Scores | TOUR Report notes

KEY ROUND 3 VIDEO:
• Watch the best shots from Saturday's LIVE@ coverage at Bay Hill.
• Bubba Watson shot 68 thanks in part to two putts of more than 30 feet.
• Tiger Woods birdied the 17th hole but failed to make a move with a Saturday 74.

Round 4 weather forecast

Partly cloudy Temp: 88 high/61 low Partly cloudy and breezy with winds around 10-15 mph and gusting to 25 mph.

ShotLink player notes

Here are some of the players you'll see on the NBC Sports' coverage of Sunday's fourth round

MARTIN LAIRD Currently 21st in the FedExCup standings, Laird will crack the top 5 moving to 4th should he go on to win Sunday. Laird was the most improved player in the FedExCup standings in 2010, moving from 146th in 2009 to 11th last year. SPENCER LEVIN Has been extremely solid on and around the greens of Bay Hill Club & Lodge this week. Through three rounds, he leads the field in scrambling, salvaging par or better on 15 of 18 missed greens, averaging 7 feet 2 inches to the pin on all chip shots from around the green. On the greens, Levin has converted a field-leading 12 putts from beyond 10 feet (most in the field through three rounds). He's converted 9 of 16 putts from 10 to 20 feet (56 percent conversion percentage from 10 to 20 feet).

-ShotLink notes provided by Alex Turnbull