As they're about to start a practice game, Sakuragi's being his usual annoying self as he teases Ryota on his height. Out of nowhere comes a basketball that whacks Sakuragi on the head, and it turns out to have been thrown by Rukawa, who really, by this point, does nothing but eat, sleep, play basketball and torment Sakuragi.
 

The rest of the Gundam are wondering why Sakuragi can't concentrate on the game as much as the rest of the players, while it's obvious that it's because Rukawa's vexing him. And then Yohei gets this little smirk and says something along the lines, "I have another theory on that..."
 

Yeah, I have a twisted little brain. Rukawa, after carefully taking off his own shirt, intentionally bumps into Sakuragi to get out of the way while they're clearing up. And the whole "wringing his shirt to get the sweat out" thing -- just a ploy to get Sakuragi to take off his own shirt, if you ask me. (The fact that Sakuragi completely ruined his shirt and had to go through the rest of the night topless was just a bonus, eh?)

They have a one-on-one on court, the first time they've ever done so. Rukawa doesn't hesitate to prove his dominance. (Oh, that came out so wrong...)

Sakuragi has a nightmare about Rukawa beating him the previous night. I believe this is the second dream sequence for Sakuragi in the series, both of which do feature appearances by Rukawa... He dreams about the kitsune! Woot!

Oh, fine, this scene is not really specifically RuHanaRu-ish, but I'm including it here anyway.

It's the first of the Shohoku vs Josei training camp games, and Shohoku isn't doing too well. During a charged time-out Akagi mentions that he wonders how Sakuragi's going back at school, and the thought of Sakuragi laughing in their faces riles up the entire main line-up into playing as though they're on fire. 

Thou shalt note how Rukawa (busy minding his own business) suddenly tilts his head up when Akagi mentions Sakuragi's name -- before the captain mentions the red-head's probable reaction to their losing.