The Guardians are losing their extraordinary leadoff hitter for a bit and adding one with power and potential. Cleveland placed outfielder Steven Kwan, who leads the AL with a .353 average, on the 10-day injured list Monday with a strained hamstring he sustained over the weekend. The team said he will likely be out for a month. Kwan’s injury is giving the team a chance to promote hard-hitting prospect Kyle Manzardo, who has been bashing minor league pitchers this season and will now join a Cleveland lineup that can use some middle muscle. The Guardians acquired Manzardo last season in a trade with Tampa Bay.