You can't count on anyone these days. One week, a player looks like she's poised to establish a consistent run of success -- the next, she's eating a bagel on her favorite surface a week after winning the first title of her comeback.
Justine Henin, who won Stuttgart and then suffered a first-round loss in Madrid, isn't the only one riding the results roller coaster. She and her fellow Belgians looked set to be a force this year after going 24-0 against the rest of the tour to start the season. Now, Henin is dealing with a broken finger and an energy-sapping cold, Kim Clijsters is sidelined with a foot injury and Yanina Wickmayer is recovering from elbow surgery.
Serena Williams won the Australian Open, then was sidelined with a knee injury for the next two months. Returning last week at Rome, she reached the semifinals and looked to be rounding into form, only to almost get knocked out in the first round of Madrid this week -- she saved match point in a 3-hour, 26-minute marathon against Vera Dushevina, the longest match of her career. And Williams is the closest the tour has come to having a benchmark of consistency over the past couple of years.
It's not even safe to write players off. Jelena Jankovic has resurrected herself with a title at Indian Wells and wins over both Williams sisters at Rome. And fellow Serb Ana Ivanovic stopped her freefall by defeating two top-10 players in reaching the semifinals in the Italian capital.
And things might only get wilder. We've become used to having a few big names upset early on -- think Clijsters and Sharapova at the Australian Open or Henin in Indian Wells and Madrid -- but still, the player holding the trophy at the end of a tournament has usually been one of a half-dozen predictable names.
Last week, however, there weren't just the usual plot twists, but an entirely unexpected ending as well -- the unseeded Maria Jose Sanchez Martinez carried off the title. It harks back to the mid-1990s and early 2000s on the men's tour, when anyone from Pete Sampras to semi-known Thomas Johansson to a complete unknown like Roberto Carretero could carry off a big title.
Why has the women's tour become so unpredictable? Injuries are an obvious part of the answer. Every top player has spent some time out of contention because of physical problems. Inconsistency is another. Most players blast from the baseline with little room for error, which means that when they're on, they're really on -- but when they're off even a little, it can get pretty ugly.
Pressure has been part of the mix. Clijsters' and Henin's temporary retirements and Serena's frequent hiatuses created a vacuum at the top that was filled by players who had worked hard but simply weren't ready to take up such lofty mantles. The weight of expectation helped send Ivanovic off a cliff, and Jankovic and Dinara Safina crumbled under the searching scrutiny of their modest Grand Slam résumés. One vacuum created another.
The reason these factors have had such a big impact is because they've been coupled with a genuine increase in depth on the tour. Once upon a time, a limping, unprepared or frazzled top player could show up at a big tournament and work her way through her problems. No longer. Now there's always a Lucie Safarova or Alisa Kleybanova around to pick off a top seed if they don't come up to scratch, or an in-form Kateryna Bondarenko or Maria Kirilenko prepared to hang tough in a third set. A top player who has a bad day frequently finds herself going home.
All of which means the current chaos could be here for a while. So what's a tennis fan to do? Change your mindset. It's not enough to tune in at the weekend and expect to see the top players and the best matches.
Here's how to find calm in the storm:
1. Embrace it
It's part of the cycle. These chaos periods don't produce a lot of legendary rivalries or even classic finals -- fighting through the draw leaves players tired, and early upsets can mean lopsided matchups down the road. On the other hand, there's a broader cast of characters and a lot of competitive matches if you know where to look for them.
2. Know more players
The likes of Anastasija Sevastova and Andrea Petkovic aren't just gobbledygook name-fillers in a draw. They've got talent and shots, and you need to know who they are and what they're capable of. They can turn out to be pretty interesting in their own right, too.
3. Focus on the background
Surface, physical condition and current form can often matter more than who the higher-ranked player is.
4. Adjust expectations
At other times, you might expect a player who wins a tournament to have a better chance of doing well in her next event. During periods of parity, though, it actually makes it more likely that she'll lose early the next time out.
5. Watch more matches
When details determine results, the only way to notice those details is to watch matches. Tune in on the weekend and you'll be scratching your head seeing Ana "what happened to her?" Ivanovic playing Maria Jose "is that Conchita or Arantxa?" Martinez Sanchez in the semifinals. Tune in early when they're starting to knock off the top players, and it will all make sense. Plus, you'll have a better chance of seeing the best contests of the week. Because a tournament's memorable encounters now tend to happen spontaneously throughout the draw rather than just the later rounds, watching more matches means seeing more good matches.
Kamakshi Tandon is a freelance tennis writer for ESPN.com.