The entire podium of the women's 100m hurdles from the Paris Olympics — Masai Russell, Cyréna Samba-Mayela and Jasmine Camacho-Quinn have all signed to Grand Slam Track. In an Olympics that featured several down to the wire track events decided by the slightest of margins, Russell (12.33), Samba-Mayela (12.34) and Camacho-Quinn (12.36) ran a 100m …