Tickets for Yomiuri Giants vs Hanshin Tigers (April) sold out already?

Hi there, we're heading to Tokyo in April and were hoping to catch the Yomiuri Giants vs Hanshin Tigers game.

However, am I right in thinking that the tickets are sold out already, or am I misreading the website? I'm looking at the website here

If they are sold out, which other games (between the 4th and 10th April) would be good to go and see (we're staying in Tokyo so would have to be fairly close.