JPMorgan analyst Steven Zaccone raised his price target for Callaway Golf to $23 ahead of this week's U.S. Open at Shinnecock Hills Golf Club in Southampton, NY. The recent strength in the U.S. golf market, combined with the strong reception to Callaway's new product offerings, should drive upside to Street estimates, Zaccone tells investors in a research note. The analyst believes Callaway's fiscal 2018 guidance "conservatively embeds" first half market growth of 9%-10% decelerating to flat-to-low growth in the second half. He reiterates an Overweight rating on the shares.