In fantasy baseball, it is general knowledge that your league championship isn’t won on draft day. One major key to success is staying active on the waiver wire.

As we are a month into the season, the easiest way to acquire talent is by adding free agents. Below, are four players who are under ten percent owned on ESPN.com, but should be rostered in the majority of formats.

With Adrian Beltre injured, and Joey Gallo manning third base, DeShields has earned himself the everyday roll in left field. He was a former first-round pick in 2010, and has bounced between the major and minor-league levels since 2015. The 24-year-old has plenty of fantasy potential, as he is currently batting leadoff, is an elite base stealing threat, and is versatile.

DeShields can be an elite producer of runs and steals as long as he remains atop the lineup. Once Beltre returns, it will be interesting to see what the Rangers do with Gallo and DeShields, although their versatility will presumably allow them to continue to see regular playing time.

The Washington Nationals lost their starting center fielder, Adam Eaton, to a torn AC, which moves Michael Taylor into an everyday role. Taylor is a career .259 hitter in the minors, with 52 home runs and 140 stolen bases in 560 games played. The 26-year-old’s numbers aren’t overwhelming, although his opportunity to be productive with the Nationals is immense. Taylor will primarily bat seventh, which puts him behind some of the best hitters in the league, including Bryce Harper, Daniel Murphy and Anthony Rendon, which increases his opportunity to produce RBI. Also, if veteran Jayson Werth were to struggle, Taylor could sneak up to the two hole, and be an elite run producer and stolen base threat.

The 21-year-old is currently batting .402, with one home run, 16 runs scored, 14 RBI, and seven stolen bases at the AAA level. He is in line to be the shortstop of the future for New York, although it looks like he will be called up in 2017. His major-league counter parts, Jose Reyes and Asdrubal Cabrera, are playing very poorly, as both are batting under .250, giving Rosario a possible opening to major-league at-bats.

The Mets need a spark, as they have lost many core players to injuries, such as Yoenis Cespedes, Noah Syndergaard and Steven Mats to name a few. Keep an eye out for Rosario, as he is exactly what the Mets need, and should see a call-up sooner than later.

Vargas was called-up to the Twins in late-April, and has batted .364 with two home runs, eight runs scored and six RBI in six games played. He can hit for contact and power, as he is a career .277 hitter in the minors with 89 home runs, so as long as he continues to bat in the heart of the order, he will have the opportunity to be an elite fantasy producer.

The 26-year-old has taken over for Joe Mauer twice at first base, but is playing majorly designated hitter this season. The Twins have plenty of flexibility with their bats, as they can move Vargas or Sano to a corner outfield spot to ensure they continue to get at-bats.

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