Behind a four-run third inning, the Chicago Cubs and Marcus Stroman bested their division rival Milwaukee Brewers on Opening Day. The Chicago Cubs topped the Milwaukee Brewers, 4-0, on Opening Day in front of 36,054 patrons in 42-degree weather at Wrigley Field. Marcus Stroman was brilliant over six strong innings. The 31-year-old needed 90 pitches to keep the Brewers at bay, finishing with a line of: 6.0 IP, 3 H, 0 ER, 3 BB, 8 K. The Cubs’ offense plated all four of their runs in the third inning off Brewers starter Corbin Burnes, who had a 2.63 ERA in…