Ed Szczepanski-USA TODAY Sports
Anquan Boldin helped the Ravens defeat the 49ers in the Super Bowl.
The biggest area of uncertainty on the 49ers' roster is at wide receiver. The injury to Michael Crabtree, the 49ers' top receiver, has severely depleted this group. Crabtree suffered a torn Achilles, but is hoping to return late in the season.
The loss of Crabtree leaves a huge void in the 49ers' receiving corps. In 2012, Crabtree had 85 catches for 1,105 yards and nine touchdowns, all career highs.
The 49ers acquired Anquan Boldin from the Ravens, and he has already begun to make an impact. Boldin, who will be in his 11th NFL season, has been very helpful to the 49ers' young receivers.
Boldin is still a very productive receiver, as he proved in 2012. He had 65 receptions for 921 yards and four touchdowns.
Boldin riddled the 49ers' secondary in the Super Bowl with six catches for 104 yards and a touchdown.
However, after Boldin, the 49ers have major question marks at the wide receiver position. Veteran Mario Manningham is trying to come back from a devastating knee injury and is not likely to be ready to play until the middle of the season. Whether Manningham will ever return to his old form is questionable.
Kyle Williams is the only other 49er receiver with game experience in a San Francisco uniform. In 2012, Williams had 14 catches for 212 yards, but was lost for the season with a knee injury in the 49ers' 11th game of the year.
In three injury-plagued seasons, Williams has a total of 35 catches. He has shown some positive flashes, but his injury history makes him very difficult to count on. In college at Arizona State, Williams was unable to stay healthy, and the same problems have dogged him in San Francisco.
Ricardo Lockette is a promising young receiver with good size and speed. He worked extensively with 49ers' quarterback Colin Kaepernick this spring. Lockette played briefly with the Seahawks in 2011.
The 49ers' fourth-round selection in the 2013 draft was wide receiver Quinton Patton. He was extremely productive in his two seasons at Louisiana Tech.
In two seasons, Patton caught 183 passes for 2,594 yards and 24 touchdowns. Although not blessed with blazing speed, Patton has good hands and catches the ball very well. The 49ers are hoping he can contribute to the offense.
The wild card in the wide receiver mix is A.J. Jenkins, the 49ers' 2012 first-round draft pick. Jenkins was on the inactive list for almost every game and did not catch a single pass last season.
The 49ers lost Manningham and Williams during the course of last season, yet Jenkins was still not deemed ready to play. Randy Moss and the oft injured Ted Ginn were utilized ahead of Jenkins and even undrafted free agents Chad Hall and Joe Hastings were ahead of Jenkins.
2013 is a pivotal year for Jenkins. The 49ers need him to make a major step forward and contribute this year. Although it was too early to deem Jenkins a bust last year, it will be a different story for Jenkins this season. If he fails to contribute again, the bust label will be one step closer to reality.
The 49ers have several other receivers on the roster, including Hall, Chuck Jacobs, Charly Martin, Marlon Moore and Kassim Osgood. These receivers will get their chance to impress during training camp, but will be a long shot to make the final 53-man roster.
Wide Receivers grade: C-