Boller became the Ravens' first round draft pick in 2003 NFL Draft (19th overall pick).
He was the second quarterback selected from the Pac-10 conference after the Cincinnati Bengals selected Carson Palmer from USC with the first overall pick.
He started the first 9 games of the season, going 5–3, before being injured (thigh) in a game against the St. Louis Rams.
He was inactive for most of the rest of the season, being replaced by backup Anthony Wright, as he also had to have surgery to repair a muscle in his quadriceps.
Boller rushed 30 times for 62 yards, and completed 116 of 224 passes for 1,260 yards with 7 touchdowns and 9 interceptions.

Boller started all 16 games the only time in his career in 2004.
He set career highs, completing 258-of-464 (55.6%) for 2,559 yards with 13 touchdowns and 11 interceptions.
He also rushed 53 times for 189 yards and his 1st-career rushing touchdown.
He had 4 games with QB ratings over 100, including a career-high 112.3 rating while going 18-of-34 for 219 yards, with a career-high four touchdowns and no interceptions against the Giants.

Despite not making the playoffs the previous year, the Baltimore Ravens were seen by the NFL and the sports media as being contenders for the Super Bowl, resulting in four primetime games: two Sunday night games, and two spots featured on Monday Night Football.
A factor in this was Boller's perceived status of "coming into his own", and so the Ravens were poised to start what would be a great season by taking on the Indianapolis Colts on the first primetime Sunday Night game of the season.
The Ravens held their own in the first half, limiting the Colts to only 3 points, and Boller looked solid in the pocket, leading the offense down the field to the red zone several times.
But it did not last, as Boller was injured in the third quarter, suffering a bad case of "turf toe", that would wind up keeping him out of action for 7 games.
The Ravens season went downhill after that, even going four games without a single passing touchdown.

When Boller came back against the Bengals, after posting an 8.0 QB rating (4-of-12 [33%] for 37 yards and 1 interception) in the 1st half, Boller exploded in the 2nd half, going 14-of-20 [70%] for 174 yards, 3 touchdowns and 1 interception for a 115.4 QB rating in the final 2 quarters.
In back to back games, he (and the entire team) finally seemed to come alive and show the promise everyone had been expecting, as he completed 19-of-27 passes (70.4%) for 253 yards, 3 touchdowns and no interceptions for a career-high 136.8 QB rating in the 48–3 victory in Week 14 vs. the Green Bay Packers.
Then, against the Minnesota Vikings, he posted a career-high 70.6 completion percentage (24-of-34) for 289 yards, 3 touchdowns and 1 interception for a 113.5 QB rating.

However, despite this, he still finished 2005 completing a career-high 58.4% of his passes (171-of-293) for 1,799 yards with 11 touchdowns and 12 interceptions despite missing almost 8 games due to injury.

Steve McNair, former Tennessee Titans QB, was traded to Baltimore in 2006.
Coach Brian Billick declared McNair the starter instead of having the two compete for the job, citing McNair's credentials, including 2003 NFL Co-MVP, and Boller's propensity to turn over the ball.
In Week 6 of the 2006 NFL season, McNair was sacked by Carolina Panthers defenders Mike Rucker and Chris Draft.
The result of that play was a mild concussion and a neck injury.
McNair left the game and would not return.
Boller came in to replace him in the final seconds of the first quarter, and completed 17 of 31 passes for a 58% completion percentage, 3 touchdowns, 226 yards, and one interception.
Faced with a 9-point deficit with 5:10 remaining, Boller connected with Mark Clayton for a 62-yard touchdown pass to start a comeback attempt.
When the Ravens defense gave up their second touchdown of the day, Boller was called upon to score again.
This time, he faced 68 yards and was given 4:08 to score a touchdown, to still be behind in the game.
He drove down the field and capped off his drive with a 7-yard t
Boller became the Ravens' first round draft pick in 2003 NFL Draft (19th overall pick). He was the second quarterback selected from the Pac-10 conference after the Cincinnati Bengals selected Carson Palmer from USC with the first overall pick. He started the first 9 games of the season, going 5–3, before being injured (thigh) in a game against the St. Louis Rams. He was inactive for most of the rest of the season, being replaced by backup Anthony Wright, as he also had to have surgery to repair a muscle in his quadriceps. Boller rushed 30 times for 62 yards, and completed 116 of 224 passes for 1,260 yards with 7 touchdowns and 9 interceptions.
Boller started all 16 games the only time in his career in 2004. He set career highs, completing 258-of-464 (55.6%) for 2,559 yards with 13 touchdowns and 11 interceptions. He also rushed 53 times for 189 yards and his 1st-career rushing touchdown. He had 4 games with QB ratings over 100, including a career-high 112.3 rating while going 18-of-34 for 219 yards, with a career-high four touchdowns and no interceptions against the Giants.
Despite not making the playoffs the previous year, the Baltimore Ravens were seen by the NFL and the sports media as being contenders for the Super Bowl, resulting in four primetime games: two Sunday night games, and two spots featured on Monday Night Football. A factor in this was Boller's perceived status of "coming into his own", and so the Ravens were poised to start what would be a great season by taking on the Indianapolis Colts on the first primetime Sunday Night game of the season. The Ravens held their own in the first half, limiting the Colts to only 3 points, and Boller looked solid in the pocket, leading the offense down the field to the red zone several times. But it did not last, as Boller was injured in the third quarter, suffering a bad case of "turf toe", that would wind up keeping him out of action for 7 games. The Ravens season went downhill after that, even going four games without a single passing touchdown. 
When Boller came back against the Bengals, after posting an 8.0 QB rating (4-of-12 [33%] for 37 yards and 1 interception) in the 1st half, Boller exploded in the 2nd half, going 14-of-20 [70%] for 174 yards, 3 touchdowns and 1 interception for a 115.4 QB rating in the final 2 quarters. In back to back games, he (and the entire team) finally seemed to come alive and show the promise everyone had been expecting, as he completed 19-of-27 passes (70.4%) for 253 yards, 3 touchdowns and no interceptions for a career-high 136.8 QB rating in the 48–3 victory in Week 14 vs. the Green Bay Packers. Then, against the Minnesota Vikings, he posted a career-high 70.6 completion percentage (24-of-34) for 289 yards, 3 touchdowns and 1 interception for a 113.5 QB rating.
However, despite this, he still finished 2005 completing a career-high 58.4% of his passes (171-of-293) for 1,799 yards with 11 touchdowns and 12 interceptions despite missing almost 8 games due to injury.
Steve McNair, former Tennessee Titans QB, was traded to Baltimore in 2006. Coach Brian Billick declared McNair the starter instead of having the two compete for the job, citing McNair's credentials, including 2003 NFL Co-MVP, and Boller's propensity to turn over the ball. In Week 6 of the 2006 NFL season, McNair was sacked by Carolina Panthers defenders Mike Rucker and Chris Draft. The result of that play was a mild concussion and a neck injury. McNair left the game and would not return. Boller came in to replace him in the final seconds of the first quarter, and completed 17 of 31 passes for a 58% completion percentage, 3 touchdowns, 226 yards, and one interception. Faced with a 9-point deficit with 5:10 remaining, Boller connected with Mark Clayton for a 62-yard touchdown pass to start a comeback attempt. When the Ravens defense gave up their second touchdown of the day, Boller was called upon to score again. This time, he faced 68 yards and was given 4:08 to score a touchdown, to still be behind in the game. He drove down the field and capped off his drive with a 7-yard t
Kyle Boller