Chennai, Sep 26 (UNI) Teenagers Saishiva Sankaran from Pune and Visakhapatnam’s Bhuvan Bonu displayed impressive pace to win the MRF Formula 2000 and Formula 1600 races respectively, while Sri Lankan school boy too continued his winning streak in the Junior section, in the second round of the MRF 4W Indian National Racing Challenge which commenced at the Madras International Circuit, at Irungattukottai, about 40 km from here, on Saturday.