This is an example of a page that lists baseball stats for a selected player, defaulting to the most recent year (2014, soon to be 2015) http://www.koreabaseball.com/Record/
An example using Mechanize and Ruby. Modify the form field and submit.
#!/usr/bin/env ruby
require 'mechanize'
agent = Mechanize.new{ |agent| agent.history.max_size=0 }
agent.user_agent = 'Mozilla/5.0'
url = "http://www.koreabaseball.com/Record/Player/HitterDetail/Game.aspx?playerId=76325"
page = agent.get(url)
form = page.forms[0]
p form['ctl00$ctl00$cphContainer$cphContents$ddlYear']
form['ctl00$ctl00$cphContainer$cphContents$ddlYear'] = 2013
page = form.submit
form = page.forms[0]
p form['ctl00$ctl00$cphContainer$cphContents$ddlYear']