RICHMOND, Va. -- Redskins.com's Kyle Stackpole and Ryan Fowler break down the key plays and highlights from Day 3 of training camp at the Bon Secours Washington Redskins Training Center on Saturday.

Offense:

-- Quarterback Colt McCoy had a scheduled day off Saturday as he works back from multiple surgeries that forced him to miss all of offseason workouts. McCoy was a full participant over the first two days.

-- With McCoy being held out, a two-player quarterback battle unfolded between rookie Dwayne Haskins and veteran Case Keenum. Neither signal-caller was particularly sharp.

Haskins threw two interceptions, the first of which safety Landon Collins snagged on a slant route during 1-on-1 drills. During the first-team session, Haskins took a would-be sack but was still allowed to throw the ball. He looked right and delivered the ball into the hands of cornerback Quinton Dunbar for a would-be pick six.

There was also a play where Haskins underthrew an open Terry McLaurin on a go route. Pass interference would have been called on the play anyway -- Deion Harris never turned around to make a play on the ball -- but it would have went for a touchdown had Haskins hit his Ohio State teammate in stride.

As for Keenum, who began several portions of practice with the first team, he capped his performance Saturday with back-to-back interceptions to Dunbar.

-- Despite these turnovers, there were some bright spots from both quarterbacks. Haskins began 7-on-7 drills with three straight completions to different receivers, and while the connections came on shorter routes, he showed the ability to work through his progressions until the open man came available. Among Keenum's highlights included a quality throw to Steve Sims Jr. on an out route and a well-placed ball in between two defenders to Davis, who was running down the seam.

-- Keenum orchestrated another nice gain during team drills. He recognized a blitzing linebacker, kept his poise amid pressure and dumped the ball off to an open Derrius Guice in the flat.

Gruden said Guice surprised coaches last preseason with his pass-catching ability and mentioned how the team wanted to give him more opportunities to showcase that skillset moving forward. His catch and run Saturday was a prime example of that.

-- The offensive line looked a tad different Saturday with the signing of left tackle Corey Robinson, who was in uniform for the morning practice session. Gruden did not provide an update on free agent tackle Donald Penn, who worked out alongside Robinson following the team's workthrough Friday afternoon.

"We're a little short at tackle right now," Gruden said Saturday. "[Tyler] Catalina is playing a little tackle, [Ereck] Flowers is playing some tackle, and obviously the right side we're okay, but we just need another body in here and get him a chance."

Quick hits:

• Early in the session, rookie wide receiver Kelvin Harmon shook off press coverage from Josh Norman and beat the veteran cornerback on a fade route. The two worked against each other again after practice and ended up being the last two players on the field.
• Keenum connected with Cam Sims on a well-timed back-shoulder throw during 1-on-1s. Sims had a good rapport with Keenum throughout OTAs and minicamp, and that connection seems to have carried over to Richmond.

Defense:

-- With Saturday marking the first practice in pads, the defense looked to establish itself early and often. The violent cracking of pads were a welcoming sound to all in attendance during Redskins Salute Military Appreciation Day. In his morning press conference, head coach Jay Gruden labeled the session as a "glorified thud day," as full tackling was strictly prohibited.

-- Quinton Dunbar won the day. The corner had three interceptions during the session, with two coming on consecutive plays. He has looked fresh throughout the three days of practice, drawing praise from teammates Jordan Reed and Josh Norman.

"Anybody who knows [Dunbar] knows that he's capable of this, so it's not surprising," Reed said about Dunbar's hat trick. "Even at Florida, he switched to corner for one spring game, and he was better than most of the corners on the team."

"The safeties and corners are breaking on the football, [Dunbar] had three today!" Norman exclaimed. "You can't make this stuff up."

-- Rookie cornerback Jimmy Moreland was used frequently as the outside corner when working with the second unit, then found himself working both in nickel and dime packages with the starting unit. Moreland's knack for making plays was on full display throughout OTAs and minicamp and has continued in Richmond.

"That boy 25 is going to be special," Norman said Saturday, referring to the seventh-round rookie.

-- Inside linebacker Jon Bostic continued to display his experience and knowledge of NFL offenses. During 7-on-7 drills, the offense approached the line with three wide receivers in a stacked formation. Bostic quickly called an audible, instructing fellow first-team linebacker Shaun Dion-Hamilton to immediately press Jordan Reed at the line of scrimmage. That adjustment ultimately allowed the cornerback to cover Trey Quinn on a drag route and left zero options for Keenum, who eventually threw the ball away.

-- The running backs did not have much room to maneuver throughout the session. If there was a hole, one or multiple Redskins defenders quickly filled it. The duo of Jonathan Allen and Daron Payne were also frequently in the offensive backfield. Defensive line coach Jim Tomsula incorporated unique stunts and twists along the line for the first time in camp, raising confusion among the rookie offensive linemen Wes Martin and Ross Pierschbacher.

-- Landon Collins happily earned his revenge on tight end Vernon Davis on Saturday. After two near interceptions resulted in long catches for Davis during the first two days of camp, Collins stepped in front of Davis on a slant route for an interception. Collins proceeded to celebrate with his fellow teammates, much to the enjoyment of defensive backs coach Ray Horton, who shouted, "That a boy Collins, finally!"

Special Teams:

-- Trey Quinn, Greg Stroman, Steven Sims Jr. and Shaun Wilson fielded punts Saturday.