Chris Shivers leads, but with only one round in the books so far, the Ariat Invitational is still anyone's game.

Event Leaders:

Chris Shivers on 23S Stretch Armstrong:
Shivers has ridden this bull in two of their three previous meetings, the most recent of which was last week in Portland, Ore., where Shivers was 87.75 points.

Paulo Lima on 205 Big Jim:
Big Jim hasn't been on tour since Columbus, Ohio, last October, but Lima had him a month prior to that in Wichita, Kan., and bucked off. Overall, Big Jim has only been ridden by left-handed riders.

Aaron Roy on 67 Toy Soldier:
They met in Tulsa, Okla., last year, and Roy came down at 7.3 seconds. Although Toy Soldier threw Sean Willingham off last night, his odds of getting ridden are better than any bull at this event. When he is ridden, he delivers an average score of 88.5 points.

Luke Snyder on W233 Charlie Bullware:
Charlie Bullware is well-known for being a difficult bull to ride, and while he's thrown Snyder off twice before, Luke rode him with ease last weekend in Portland.

Ryan Dirteater on 602 Wild Child:
Dirteater was 88.25 points on Wild Child in Anaheim, Calif., just a couple of weeks ago.

Dirteater was 88.25 points on Wild Child in Anaheim, Calif., just a couple of weeks ago.

Ty Pozzobon on 40B Johnny B Good:
Cord McCoy was 85.5 points on this bull last night, and Billy Robinson was 86.5 points on him last week in Portland.

Dusty Ephrom on 703 Let 'er Rip:
This bull has been ridden only four times in 21 outs, and Ephrom is responsible for two of those rides. He rode him in April and October of last season.

L.J. Jenkins on 48U Rockie Smooth:
Jenkins not only rode this bull last week in Portland for 87.75 points, but he is the only man to have earned any kind of score on Rockie Smooth in 12 attempts.

Douglas Ferreira on 713 Grey Ghost:
Grey Ghost has been ridden five of 13 times overall, and three of seven times at the Built Ford Tough Series level. Ferreira is one of four riders at this level who failed to get a score. He came down in 3.34 seconds in Billings, Mont., last August.

The venerable Charlie Bullware matches up with world No. 3 Luke Snyder this afternoon, a pairing Snyder won last week in Portland, Ore.

Cord McCoy on TD2 Bucking Machine:
This is an exciting bull to watch, and can deliver a big score. He's been ridden in only one-fourth of his outings.

Josh Faircloth on 717 Hannibal:
In 14 outs, Hannibal has been ridden only three times, all three times by left-handed riders.

Marco Eguche on 857 Sue:
Justin Koon was 84 on him last night, but this bull doesn't get ridden very often. Koon's score was only the fifth score he's allowed in 33 career outs.

Jordan Hupp on 797 Express:
Look for Hupp to get another score here. Express has been ridden three of six times at this level, and by the only three right-handed riders to face him.

Kody Lostroh on U33 Don't Stray:
Unridden in only 3 outs, Don't Stray threw Ryan McConnel off last night.

Justin Koon on 723 Panther:
Good pick for Koon. This bull has been ridden more often by right-handed riders.

Kudos to Nic Lica for making it to this level, realizing what he needs to win and reaching for it.

Silvano Alves on 01T Loose Cannon:
Loose Cannon stuck Caleb Sanderson with a no-score in Round 1, and right-handed riders are 0-for-7 on him overall.

Dustin Elliott on 38 Keeping it Real:
They met at a Touring Pro Event in Asheville, N.C., last June, where Elliott came down in 3.21 seconds. This bull is likely to spin away from Elliott's hand, but Elliott rides with solid form and can deal with bulls spinning either way.

Mike Lee on 6434 MontanaCanvas.com:
This is a decent bull who is ridden more than half the time by top-tier riders, but in the past two weeks, he's been ridden for under 85 points, which is not going to place in this round.

Nic Lica on K41 Wild N Out:
This is a bold pick for a guy making his Built Ford Tough Series debut, and it raises the question: Why didn't anyone above Lica pick this bull? He's arguably the highest scoring bull in the round, and is not unrideable at all. Jordan Hupp was only 85.75 on him last week, but even with that score included, this bull delivers an average score of 88.8 points. Kudos to Lica for making it to this level, realizing what he needs to win and reaching for it.

JoryMarkiss on 481 Marmaduke:
Markiss bucked off this bull in Greeley, Colo., last June. Marmaduke looks like a bull that most guys at this level should ride, especially left-handed riders, but he has proven to be more difficult than he looks.

(Slade Long, PBR Web developer and statistician, has been crunching the numbers on bucking bulls for 13 years. In addition to his regular "Morning Line" series, published just prior to every Built Ford Tough Series performance, Long co-hosts "In the Bull Pen with Cody Lambert," a podcast recorded every Thursday prior to each BFTS event.)