codigo.py

from selenium import webdriver
from selenium.webdriver.support.ui import Select, WebDriverWait

driver = webdriver.PhantomJS()

def obtenerRoster( teamId ):

    tables = [ 'rosterPitchers', 'rosterCatchers', 'rosterInfielders', 'rosterOutfielders' ]
    url    = 'http://www.milb.com/roster/index.jsp?cid='+str(teamId)

    driver.get( url )

    for t in tables:
        ti = driver.find_element_by_xpath('//*[@id="'+t+'"]/div/div[1]/table/tbody')
        for ri in ti.find_elements_by_tag_name('tr'):
            for ci in ri.find_elements_by_tag_name('td'):
                print( ci.text )

obtenerRoster( 672 )