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Grabbing impact free agents is still a significant key to success during the final weeks of your Fantasy football playoffs. Houston wide receiver Chad Hansen has made an unexpected splash in the team's passing game, as he has become one of the Texans' leading pass-catchers over the past two games. Should Hansen be considered a prime pick among your Week 15 NFL Fantasy football waiver wire targets? 

Minnesota Vikings tight end Irv Smith Jr. returned to action on Sunday and scored over 16 Fantasy points. Should Smith be one of your top Week 15 Fantasy football waiver wire targets? Before determining who to target on the Week 15 Fantasy football waiver wire, be sure to see what SportsLine's resident Hall of Famer, Scott Engel, has to say.

Engel is an inaugural member of the Fantasy Sports Writers Association's Hall of Fame. He is a four-time FSWA Award Winner and nine-time finalist, and has pulled off a three-peat in his prestigious New York City Fantasy Football League that includes other experts and high-stakes players. 

Engel made the playoffs in 14 of his 16 Fantasy Football leagues this season. He had winning records in all but one. He won seven of his nine first-round playoff matchups in Week 15. This season, he recommended Justin Herbert, Cam Akers and Robert Tonyan in advance of them becoming popular Fantasy free agent additions.   

Now, he's revealed the best widely available Fantasy football free agents entering Week 15. You can see his top Fantasy NFL waiver wire picks and full analysis over at SportsLine

Top Fantasy football waiver wire picks for Week 15

One player Engel is advising Fantasy players to target on the Week 15 waiver wire: Miami Dolphins wide receiver/running back Lynn Bowden Jr. If you are still looking for running back, wide receiver or flex help, or a streamer at any of those positions during the Fantasy postseason, Bowden Jr. checks all the boxes. 

Depending on your league's eligibility requirements, Bowden, who is operating at wide receiver for Miami, can be used at any or all of those positions. His unique eligibility right now and a growing role in the Dolphins passing game makes him a very nifty free agent add.

If you can use Bowden at running back, he could pile up Fantasy points faster than other standard players at the position. The rookie can be a distinctive replacement at a Fantasy RB2 spot if you are scrambling for options there. Or you can simply consider him as a WR3 or flex option if one is needed. 

Bowden led the Dolphins in receptions (seven) and yards (82) in Sunday's game vs. Kansas City. Miami has been hoping another playmaker would emerge in the passing game, and Bowden appears to be answering the call late in his rookie campaign.

Another waiver wire target Engel is all over entering Week 15: San Francisco 49ers running back Jeff Wilson Jr. Wilson has become a prominent contributor in the team's backfield. Health issues have caused constant change in the San Francisco running back picture, but a Wilson appears have gained a firm foothold as part of a time share. He registered his fifth rushing TD of the season on Sunday, 

Kyle Shanahan seems to trust Wilson as a goal-line option. He has nine rushing TDs over the past two seasons in 19 games played. Wilson has also seen double figures in carries in three of his past four games. If the oft-injured Raheem Mostert misses any more time late in the NFL regular season, Wilson could potentially see an increased role during your Fantasy football title drive.

How to set your Week 15 waiver wire claims

Engel is also all-in on a quarterback who should be an immediate add. This player is still widely available and could be a huge boost to your Fantasy football lineup moving forward. You can only see who it is at SportsLine

So which players should you target on the Fantasy football waiver wire before Week 15? And which quarterback is a must-add? Visit SportsLine now to see the best league-winning Fantasy football free agents entering Week 15, all from a Fantasy Hall of Famer, and find out.