Coming off four consecutive losing seasons, the San Francisco 49ers have plenty of reasons to be optimistic about their upside heading into 2019.

Things quickly veered off course for San Francisco last season when quarterback Jimmy Garoppolo tore his ACL in a Week 3 loss to the Kansas City Chiefs.

The defense was unable to pick up the slack left by Garoppolo's absence, finishing 28th in points allowed (435) and setting an NFL record for fewest takeaways in a season (seven).

Getting Garoppolo back in head coach Kyle Shanahan's system, along with some notable free-agent acquisitions on defense, have the 49ers hoping they will play closer to the team that finished 2017 on a five-game winning streak than the one that went 4-12 last season.