The Cubs go for their fourth straight win. Friday notes… HE’S ACTUALLY… GOOD: Mark Leiter Jr., last 18 appearances since July 30: 1.75 ERA, 0.935 WHIP, 27 strikeouts in 25⅔ innings. THE PITTSBURGH-AREA NATIVE: Ian Happ has reached base safely in each of his last 27 games against the Pirates dating to April 10, 2021. Happ has batted .353/.442/.569 (36-for-102) with 10 doubles, four homers, 17 RBI, 17 walks and a 1.011 OPS against Pittsburgh during this stretch. BULLPEN UPDATE: Over the Cubs’ last 13 games, the bullpen has posted a 2.36 ERA (12 earned runs in 45⅔ innings) with…