The 20 - year - old has matured .
The 20 - year - old learned a little bit of humility since then , but his brashness is part of what helps him be a good pitcher , as he 's aggressive , attacks hitters and trusts his stuff .
The 20 - year - old has matured and learned a little bit of humility since then , but his brashness is part of what helps him be a good pitcher , as he 's aggressive , attacks hitters and trusts his stuff .