ICYMI, Bethanie Mattek-Sands reveals a new hairstyle, Serena Williams writes to unborn child and Roger Federer heads to Seattle for The Match for Africa 4 Check it out in this week's must see social posts:

Sloane Stephens hits the court, Bethanie Mattek-Sands reveals new hairstyle, and Serena pens letter to her unborn child--check out the must see social media posts from the week of April 29, 2017.