Prithvi Shaw marked a spectacular return to competitive cricket by smashing a century in his second innings for Mumbai to put them on top against Chhattisgarh in their Ranji Trophy Group B fixture in Raipur on Friday. The 24-year-old, who captained the 2018 U-19 World Cup-winning team, struck 18 boundaries and three sixes in his knock of 159 off 185 deliveries. The opener reached the three-figure before lunch and in the process became the first …