The surging Chicago Cubs are headed west for a series in San Francisco having won three straight and nine of 10. The NL Central leaders have limited opponents to three or fewer runs in 12 of 13 games, a trend they'll try to continue with right-hander Zach Davies (2-2) on the mound. The Giants have won six of eight and continue to be a surprise contender alongside the Dodgers and Padres in the NL West.