The giants of tennis keep moving forward at the Australian Open. Four Grand slam winners, as well as the top four seeds, are still alive on the men's side in the quarterfinals including Novak Djokovic, Rafael Nadal, Roger Federer, Andy Murray and former U.S. Open Champion, the 11th-seeded but always dangerous, Juan Martin Del Potro.

Results are inconclusive although numbers slightly skew towards this year being tougher.

I've just returned from my annual holiday mountain biking trek to Tucson, Ariz. It's not easy for me to escape from tennis responsibilities while in Tucson because the 12's and 14's Winter Super Nationals are here, and this year, five of my players competed.

Some players have one coach. Some players have multiple coaches. How much is too much?