Injury-jinxed Louk Sorensen has suffered another heart-breaking setback.
After only recently resuming the chase for world ranking points following a seven-month injury lay-off, Sorensen is facing more time on the sidelines after suffering a ligament injury to his left knee.
The Irish No 2 did the damage during a 10-day training programme in Florida, so he was forced to pull out of the top-tier ATP World Tour US Claycourt Championships in Houston.
Initially, it was feared that Sorensen, who had just completed three tournaments in South America, would have to undergo surgery, but a definite decision has not yet been made in that regard.
"Louk has been having physio treatment and the specialist will have another look at his knee towards the end of this week," said his father Sean, the former Ireland Davis Cup boss.
"After examining the knee, the specialist will then decide whether Louk needs an operation or if treatment and rest would be sufficient for him to make a good recovery."
Either way, Stuttgart-based Sorensen could be sidelined for a number of weeks.
Ireland Davis Cup boss Garry Cahill is now hoping that Sorensen will not be ruled out of the Europe-Africa Zone Group 2 relegation showdown with Tunisia at David Lloyd Riverview on July 8-10.
The 2010 Australian Open hero has already missed last month's Davis Cup first-round defeat by Luxembourg at the same venue.
In addition, because of a combination of hamstring and pubic muscle problems, Sorensen was ruled out of both of last year's ties against Turkey and Lithuania.
Meanwhile, Sorensen's Davis Cup team-mate Colin O'Brien is hoping to return to tournament action early next month.
O'Brien has been sidelined since late January because of bone bruising on his hand.
Apart from being unable to chase world ranking points for over two months, the 26-year-old Dubliner was forced to cry off the Davis Cup tie against Luxembourg.
Shortly after sustaining his injury, the Malahide man had a scan on his arm, but that proved to be inconclusive.
"At the time, there was still a lot of bruising on my arm, so the scan couldn't see past that," explained O'Brien, who at 609 in the singles world rankings is placed third, behind Conor Niland and Louk Sorensen in the Irish national list.
At 443 in doubles, he is second, behind James Cluskey.
"The bulk of the bruising has now gone down and I'm going to have another scan soon just to be sure there is no fracture in the bone," he added.
"Last week, I started using the hand again in the gym and if the second scan turns out to be clear, I am hoping to be hitting balls again soon after that.
"So, if everything goes well, I could be back playing tournaments by early May."