Remember this? Serena Williams, yelling and cursing and shakinga racket at a line judge.Or this? Roger Federer, losing a Grand Slam final to someoneother than Rafael Nadal.Or this? Maria Sharapova, exiting in the third round againstMelanie Oudin, a teenager from Marietta, Ga., with “BELIEVE”stamped on her sneakers.Or this? Kim Clijsters, about a month into her second career,celebrating a U.S Open title while her 18-month-old daughterfrolicked around the court.The most unforgettable scenes from the last major championshipof 2009 provide hints at what to watch for in tennis in 2010.Williams’ two years of Grand Slam probation for her outburst inNew York start at next week’s Australian Open, and her on-courtdemeanor is sure to be monitored closely by fans and officialsalike. If she commits another “major offense,” she will be bannedfrom a Grand Slam tournament – although no one expects that tohappen.“It was so divergent from the Serena we all know,” WTAchairman and CEO Stacey Allaster said. “She has admitted to actingwrongly. She herself said she’s not proud of what happened in thatmoment and apologized on several occasions. She’s very determined,and I have no doubt that she’s learned from the incident.”Also worth keeping tabs on, of course, is how well Williamsplays, whether she…