The 49ers announced that they have waived wide receiver Keshawn Martin. Taking his place will be fellow wideout Chris Harper, who was promoted from the practice squad. 
Martin missed the cut as the Patriots dropped down to a 53-man roster this year. A few weeks later, he hooked on with San Francisco on a two-year contract. It’s not clear whether there was guaranteed money in the deal, but we’re guessing that the Niners aren’t going to be on the hook for much, if anything.
Last year, Martin averaged 11.2 yards per reception with New England, though that came on a limited sample size of 24 receptions. Prior to the 2015 season, Martin spent his first three seasons with the Texans and saw the field in every regular season contest from 2012-2014. For his career, Martin has averaged 25.2 yards per kick return.
Harper was promoted to the 49ers’ varsity squad for the season opener but was dropped immediately after, leading him back to the SF practice squad. The 22-year-old (23 in December), bounced on-and-off the Patriots’ 53-man roster during his rookie campaign in 2015, and ultimately appeared in five games with the club.